Bathrooms
177 sources in the library on bathrooms, 15 on this page cited in a published note. Each one says what the document covers and what it is good for. Name a source to see which document it is and where to read it. One at a time. Page 3 of 5.
- supplier figure RN-GKXYX2 cited
Toolstation
the retail price Toolstation publishes for ebb flo thermoset soft close toilet seat, which is the supply figure the cost book records for this item. Re-sourced from a category listing so the page a reader opens is the product that was priced
Cited in How to Fit Toilet Seat.
- supplier figure RN-E6Z2C7 cited
Toolstation
Toolstation's product page for a branded height-adjustable dual flush syphon for lever cisterns at £21.49, a mid-range point in the dual flush syphon row.
- supplier figure RN-NQMVH6 cited
Toolstation
A retailer product page for a WC support frame with a concealed in-wall cistern for a wall-hung pan. It gives the cistern depth and the current price.
Cited in How to Hide Pipes Behind Toilet.
- supplier figure RN-EUM648 cited
Toolstation
Toolstation, nuie arno double door wall hung vanity unit gloss white 500mm. Held in the cost register as a price source for "Vanity unit with basin, wall hung"; the passage quoted against it reads: nuie Arno Double Door Wall Hung Vanity Unit Bleached Oak 500mm With Slim Edge Basin £207.99 ex. VAT £173.32
Cited in Bathroom Remodel Cost: 2026 UK Price Guide, Cost of a New Bathroom (Full Breakdown).
- supplier figure RN-6RI6T9 cited
Toolstation
the retail price Toolstation publishes for nuie l shaped shower bath with panel and leg set, which is the supply figure the cost book records for this item. Re-sourced from a category listing so the page a reader opens is the product that was priced
Cited in Baths Compared: Freestanding, Inset & Shower Baths.
- supplier figure RN-K18EZE cited
Toolstation
Toolstation product page for a 1,700 mm acrylic P-shaped shower bath sold with a curved bath screen and side panel, priced at £430.49 including VAT.
Cited in Baths Compared: Freestanding, Inset & Shower Baths.
- supplier figure RN-Z4F0GS cited
Toolstation
the retail price Toolstation publishes for nuie vault single door compact wall hung vanity unit with ceramic basin 400mm, which is the supply figure the cost book records for this item. Re-sourced from a category listing so the page a reader opens is the product that was priced
Cited in Basins & Vanity Units: A Buyer's Guide, Creating a Downstairs Toilet: Cost & Rules.
- supplier figure RN-0RRTD7 cited
Toolstation
Toolstation product page for a basic polypropylene toilet seat; it states the adjustable hinge spacing range, showing seats are made to fit a range of pan fixing centres.
Cited in How to Fit Toilet Seat.
- supplier figure RN-VXVER5 cited
Toolstation
Toolstation's product page for a 9.5 kW electric shower that diverts between a handset and a fixed rainfall head, priced at £355.99. It sets the low end of the electric rain shower row.
- supplier figure RN-W7J45T cited
Toolstation
Toolstation's product page for a 9.0 kW digital electric shower with a rainfall head and five-spray handset, priced at £517.49. It sets the upper end of the electric rain shower row.
- supplier figure RN-F015IT cited
Toolstation
Toolstation's product page for a height-adjustable (190 to 288 mm) dual flush syphon with internal overflow at £6.79. It sets the low end of the dual flush syphon row.
- supplier figure RN-4V8HMX cited
Triton Showers
A shower maker's table of recommended fuse or MCB ratings by shower power. It sets 32 A for a 7.5 kW unit rising to 45/50 A for a 10.5 kW unit, as typical guidance to be confirmed against the installation instructions.
- supplier figure RN-JL5YWI cited
Warmup
A UK electric underfloor heating maker's product page giving the heating wire thickness of its mat system as 1.8 mm, a product dimension.
- supplier figure RN-2L2GEC cited
Warmup
A heating mat maker's installation manual: it requires 30 mA RCD or RCBO protection, sensor placement between cable runs and correct mat sizing.
- supplier figure RN-H28VAE cited
Wickes
the retail price Wickes publishes for Linear 30mm Wetroom Shower Tray with Centre Drain Level Access 1200 X 900mm, which is the supply figure the cost book records for this item
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Department of Finance (Northern Ireland)
Northern Ireland's accessibility rules for a dwelling's sanitary provision, October 2012. Section 10 requires a water closet in the entrance storey, or the principal storey, reachable from the habitable rooms of that storey without negotiating a stair; where a bathroom exists on that storey the WC may sit inside it. Paragraph 10.2 requires a clear space of not less than 900 mm by 750 mm at the WC for a person with a disability, and allows the washbasin to project into that space provided it does not impede access; frontal access centres the space on the pan, oblique access offsets it towards the approach. Paragraph 10.4 requires the doorway to be positioned so a wheelchair user can reach the clear space and, for oblique access, that the door edge is not in front of or 250 mm behind the WC unless there is room to manoeuvre. Paragraph 10.5 requires the door to open outwards or not to impinge on the clear space at any point of its swing. Table 10.1 sets clear opening widths against circulation route width: 750 mm head on from a 900 mm route, 750 mm not head on from 1200 mm, 775 mm not head on from 1050 mm, 800 mm not head on from 900 mm. Section 11 covers socket outlet and switch heights.
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Department of Finance and Personnel, Northern Ireland (Building Control NI)
Northern Ireland's equivalent of Approved Document G, issued under the Building Regulations (Northern Ireland) 2012 and the source to cite for a reader in NI. Regulation 85(1) requires a dwelling to have at least one water closet, one washbasin and one fixed bath or shower. Regulation 86(2) requires every washbasin, bath and shower to have a piped supply of hot and cold water. Regulation 87(2) requires the hot water supply to any fixed bath to be designed and installed so the temperature delivered to that bath does not exceed 48 degrees C, the same scalding limit as England and Wales. Regulation 88 governs unvented hot water storage systems, and the guidance splits them at 500 litres storage and 45 kW: Section 2 covers systems up to 500 litres and 45 kW, then systems over those thresholds, with a separate part on discharge pipes from tundishes.
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Department of Finance, Northern Ireland (Building Control NI)
Northern Ireland's ventilation guidance, the devolved counterpart to Approved Document F, and a clean source for extract rates because its Table 2.1 sets them out room by room. Intermittent extract minimum rates: kitchen 30 litres per second adjacent to the hob or 60 litres per second elsewhere, utility room 30 litres per second, bathroom 15 litres per second, sanitary accommodation 6 litres per second. Continuous extract minimum high rates: kitchen 13 litres per second, utility room 8, bathroom 8, sanitary accommodation 6. The whole-dwelling ventilation rate should not be less than 0.3 litres per second per square metre of internal floor area, and where a greater level of occupancy is expected an extra 4 litres per second per occupant should be added. It describes System 1, background ventilators with intermittent extract fans, as the common domestic strategy. The 30 versus 60 litres per second split is the figure that decides whether a cooker hood can sit above the hob or must be sized up when placed away from it, for example over an island.
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Department of Finance (Northern Ireland)
The Northern Ireland index of technical booklets, which take the place of England's Approved Documents under the Building Regulations (Northern Ireland) 2012. Current editions: B materials and workmanship (July 2013), C site preparation and resistance to contaminants and moisture (October 2012), D structure (October 2012), E fire safety (October 2012), F1 conservation of fuel and power in dwellings and F2 in other buildings (both June 2022), G resistance to the passage of sound (October 2012), H stairs, ramps, guarding and protection from impact (October 2012), J solid waste (October 2012), K ventilation (October 2012), L combustion appliances and fuel storage (October 2012), M physical infrastructure for high-speed communications networks (January 2017), N drainage (October 2012), P sanitary appliances, unvented hot water storage and reducing the risk of scalding (October 2012), R access to and use of buildings (October 2012) and V glazing (October 2012). Note for any electrical note: there is no Northern Ireland technical booklet covering electrical safety, so there is no Part P equivalent and no electrical competent person self-certification regime there. Ventilation is Booklet K, drainage Booklet N and glazing Booklet V, not F, H and K as in England.
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GOV.UK
The council grant for adapting a home, and what work it can pay for. Eligibility covers physical disability, learning disability, age-related needs, autism, cognitive impairment such as dementia, a progressive condition such as motor neurone disease, terminal illness and mental health conditions. The listed works are wide enough to cover substantial building work: widening doors and installing ramps or grab rails, improving access to rooms and facilities with a stairlift or level access shower, improving access to the garden, building an extension such as a downstairs bedroom, providing a heating system suitable for the applicant's needs, and adapting heating or lighting controls. Confirms a Disabled Facilities Grant does not affect any other benefits the applicant receives.
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GOV.UK
Carries the maximum grant by nation, which differs across the UK and is the figure most articles quote wrongly. England up to 30,000 pounds, Wales up to 36,000 pounds, Northern Ireland up to 25,000 pounds, and in Scotland Disabled Facilities Grants are not available at all, with support instead provided through equipment and adaptations schemes. Some councils may give more. The award is means tested on household income and household savings over 6,000 pounds, but disabled children under 18 can get a grant without their parents' income being taken into account, and landlords can get one without their income and savings being assessed, though the council may require the property to be let to another disabled person if the tenant moves within 5 years. Warns that starting work before the council approves the application may mean no grant at all. Payment is either in instalments as work progresses or in full on completion, paid to the contractor directly or through the applicant, and where the applicant or a relative does the work the council will normally only accept invoices for materials or services bought.
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Health and Safety Executive
The HSE's proportionality statement on legionella in domestic property, which corrects the common claim that landlords need a paid legionella certificate. Defines a landlord for this purpose as anyone renting out a property they own under a lease or licence shorter than 7 years, covering local authorities, housing associations, private landlords, housing co-operatives and hostels, and including renting a room within your own home. Identifies the legal basis as section 3(2) of the Health and Safety at Work etc Act 1974, with section 53 treating landlords as self-employed, plus the Control of Substances Hazardous to Health Regulations, and the Approved Code of Practice L8 on the control of legionella bacteria in water systems. States plainly that while there is a duty to assess the risk, this does not require an in-depth, detailed assessment, and that risks in most residential settings are generally low because of regular water usage and turnover. Sets out the low-risk profile: daily water use sufficient to turn over the entire system, cold water direct from a wholesome mains supply with no stored water tanks, and hot water from instantaneous or low volume heaters.
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Health and Safety Executive
HSG274 Part 2, second edition 2024, ISBN 978 0 7176 6753 6, issued under the HSW Act 1974, COSHH 2002 and the Management of Health and Safety at Work Regulations 1999. Paragraph 2 sets the risk trigger: water stored or recirculated, any part of the system between 20 and 45 degrees C, deposits such as rust, sludge or scale, and droplets that can be dispersed. Paragraph 2.6 gives the temperature regime: cold below 20 degrees C, hot stored at least at 60 degrees C and distributed so it reaches 50 degrees C (55 degrees C in healthcare) within one minute at the outlets. Cold branches should deliver close to incoming temperature within two minutes of running, and stored cold water should not normally exceed one day's use. Combination cylinders may store cold at up to 25 degrees C serving other outlets or 38 degrees C serving the hot vessel only, per the Water Supply (Water Fittings) Regulations 1999, the Scottish Water Byelaws and BS 3198. Circulating return to the calorifier not less than 50 degrees C; shunt pumps must raise the whole vessel, including solar-heated cylinders, to 60 degrees C. Appendices 4 and 5 illustrate sentinel points.
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Health and Safety Executive
The HSE leaflet that carries the temperature range every hot water and cylinder note should cite. States there is a reasonably foreseeable legionella risk where water is stored or re-circulated, where water temperature in all or part of the system is between 20 and 45 degrees Celsius, where there are nutrients such as rust, sludge, scale and organic matter, and where water droplets can be produced and dispersed, giving showers and cooling tower aerosols as examples. Defines legionellosis as the collective name for the pneumonia-like illness caused by legionella bacteria, covering legionnaires' disease itself plus the less serious Pontiac fever and Lochgoilhead fever, and notes everyone is susceptible but higher risk attaches to people over 45, smokers and heavy drinkers, people with chronic respiratory or kidney disease, and anyone with an impaired immune system. Legionella pneumophila occurs naturally in rivers, lakes and reservoirs in low numbers but multiplies in purpose-built systems including cooling towers, evaporative condensers, hot and cold water systems, whirlpool and spa pools, humidifiers and air washers. Published 04/12 as leaflet INDG458, and points to the Approved Code of Practice L8 for detail on control.
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Health and Safety Executive
The HSE's own temperature rules for domestic hot and cold water, and the reason a cylinder thermostat should not simply be turned down to save money. Cold water systems should be maintained where possible at a temperature below 20 degrees C. Hot water should be stored at least at 60 degrees C and distributed so that it reaches 50 degrees C, or 55 degrees C in healthcare premises, within one minute at the outlets. Against that, there is a scalding risk where water comes out of taps above 44 degrees C. For most people the scalding risk is minimal where water is delivered up to 50 degrees C at hand-wash basins and a hot water warning notice may be sufficient, but where vulnerable people can access baths or showers and the scalding risk is significant, a Type 3 thermostatic mixing valve must be fitted to prevent water discharging above 44 degrees C. The page sets out the system types it applies to, including gravity fed hot and cold storage, hot water storage only, and cold storage only with mains pressure hot water. Last updated 28 October 2024.
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Health and Safety Executive
The ACOP that gives legionella control its legal force. Fourth edition 2013, ISBN 9780717666157. It sets five dutyholder duties that carry Approved Code of Practice status, meaning a court may take failure to follow them as evidence of breach unless compliance was achieved another way: identify and assess sources of risk, prepare a written scheme to prevent or control the risk, implement manage and monitor the precautions, keep records of them, and appoint a named responsible person to manage legionella control. The fourth edition raised risk assessment, the role of the responsible person, the control scheme, review of control measures and the duties of the water system supply chain from guidance to ACOP status. Detailed technical parameters, including the 20 to 45 degrees C growth band and the 60 and 50 degrees C storage and outlet temperatures, sit in the companion HSG274 Parts 1 to 3 rather than in L8 itself.
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Health and Safety Executive
The page that explains why an R rating on a tile datasheet is not the reassurance retailers imply. HSE answers the question how do I check whether my floor is slip resistant by pointing first to the manufacturer's technical data sheet, then warning that a floor labelled R9 should be treated with caution because it indicates slipperiness when wet: the R scale comes from the German shod ramp test, which uses an oil-covered ramp and a walker in boots, and the lowest classes tell you little about a wet barefoot bathroom or a contaminated kitchen floor. HSE's own definitive measurement is the pendulum test to BS 7976, available through specialist testing services. It explains surface roughness as the fine texture of the flooring, with the analogy that sandpaper would stop you slipping in the wet whereas the smooth surface of paper would be slippery, and notes that roughness readings feed HSE's Slips Assessment Tool. It also warns that safety floors, being rougher, hold more cleaning solution and leave residue as it evaporates unless a dry mop or wet vacuum is used, and that metal profiling wears round and loses grip.
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Ministry of Housing, Communities and Local Government
The landing page for Part H of the Building Regulations in England, and the citation for which edition governed a drainage alteration. It hosts the 2015 edition, 1.23 MB, with the guidance first published to GOV.UK on 4 December 2010 and earlier editions held at the National Archives. The stated scope of the current edition is foul water drainage both above and below ground, pipe sizes, protection of pipes, and manholes and inspection chambers, which are the parts of Part H that bite whenever a bathroom or kitchen is moved rather than replaced in place. The full requirement set runs H1 foul water drainage, H2 wastewater treatment systems and cesspools, H3 rainwater drainage, H4 building over sewers, H5 separate systems of drainage and H6 solid waste storage, so a project that touches a shared or public sewer engages H4 and a build-over agreement as well as the pipe sizing in H1. The trap seal depths, minimum branch diameters, branch lengths and gradients themselves are inside the linked PDF.
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Ministry of Housing, Communities and Local Government
The canonical landing page for Part G of the Building Regulations 2010 in England, hosting the 2015 edition, 56 pages, 677 KB, with amendments in force from 1 March 2016 and from 1 October 2024, the document itself first published 3 March 2010. Its stated scope is the standards required for cold water supply, water efficiency, hot water supply and systems, sanitary conveniences and washing facilities, bathrooms, and kitchens and food preparation areas, which map to requirements G1 to G6. The page carries the version history so a reader can see which edition applied on a given build date, and links the current PDF plus the superseded versions. Use it as the citation when the question is which edition of Part G governs a project rather than what a specific clause says; the clause detail, including the 125 litres per person per day water efficiency calculation and the G3 unvented hot water storage rules, is inside the linked PDF.
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Ministry of Housing, Communities and Local Government
An 87 page field study published 1 October 2019 measuring what installed ventilation actually delivers, and its numbers demolish the assumption that a new or upgraded system performs as designed. Of 25 homes visited with continuous mechanical extract, only one met Approved Document F guidance on both extract fan air flow rates and trickle ventilator provision, with whole dwelling extract flow rates in normal low-rate mode ranging from 85 per cent below to 8 per cent above the recommended rate. Only half the homes met the minimum trickle ventilator areas, ranging from 60 per cent below to 107 per cent above the recommended area. On two of three dMEV development sites trickle ventilators had been fitted in the same rooms as the extract fans, contrary to ADF guidance, which can stop fans drawing air through the whole house. On air quality: 11 per cent of the limited monitoring sample had a room where weekly average relative humidity exceeded the recommended monthly average, always the bedroom, and condensation or mould was reported in each such room; 30 per cent exceeded the derived carbon dioxide guideline in the bedroom; and 60 per cent of the detailed monitoring sample exceeded the ADF total volatile organic compound performance standard. Ventilation was found adequate for nitrogen dioxide and carbon monoxide but not for moisture, body odour and VOCs. Notes that Part F 2010 introduced a legal requirement to test and commission installed fans and for the installer to notify the building control body of commissioning and air flow rates.
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Scottish Government
Scotland does not use the English 125 litres per person per day whole-dwelling calculation. Standard 3.27 instead fixes maximum performance on individual fittings: a dual flush WC cistern must have an average flush volume of not more than 4.5 litres, a single flush cistern a flush volume of not more than 4.5 litres, and wash hand basin and hand rinse basin taps a flow rate of not more than 6 litres per minute. The supporting text cites Scottish Water's estimate that average consumption of wholesome water is around 150 litres per person per day in Scotland, broken down as WC flushing 30 per cent, baths and taps 21 per cent, laundry 13 per cent, showers 12 per cent, drinking and other 9 per cent, washing up 8 per cent and external use 7 per cent. This is the page to cite when a reader in Scotland asks why their new bathroom specification differs from the English water calculator approach.
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Scottish Government
Scotland's scalding rule, and it is stricter and differently drawn from England's Part G. Mandatory standard 4.9 requires every building to be designed and constructed so that people in and around it are protected from severe burns or scalds from the discharge of steam or hot water. The guidance sets the limit: the temperature of hot water at the point of delivery to a bath or bidet should not exceed 48 degrees C. Note that the Scottish limit catches bidets as well as baths, where England's G3 caps baths at 48 degrees C only. Control is normally by a thermostatic mixing valve complying with BS EN 1111:1999 or BS EN 1287:1999, fitted as close to the point of delivery as practicable, with a maximum setting of 48 degrees C in a form not easily altered by building users. The section also cites BS 6283-2:1991 for temperature relief valves and BS EN 1490:2000 for combined temperature and pressure relief valves on stored hot water.
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Scottish Government (gov.scot)
Scotland's sanitary provision and accessibility rules, which go further than England's Approved Document G and are the ones a Scottish bathroom project must meet. Clause 3.12.1 requires every dwelling to have at least 1 water closet or waterless closet, 1 wash hand basin per WC, 1 bath or shower and 1 sink, normally in the kitchen, and requires a wash hand basin close to every WC either within the toilet or in the adjacent space forming the sole means of access to it. Clause 3.12.3 requires a dwelling to have at least 1 accessible WC and wash hand basin and at least 1 accessible shower or bath, with unobstructed access at least 800 mm wide to each sanitary facility and unobstructed height of at least 1.8 m above each activity space and above any bath or shower. Where side transfer is allowed a small wall-hung wash hand basin may project up to 300 mm into the activity space in front of the WC, and a projecting basin rim may reduce a route to another facility to not less than 700 mm. A hand-rinse basin may only be installed in a toilet where a full-size wash hand basin exists elsewhere in the dwelling. Clause 3.12.5 applies the accessibility guidance to alterations and extensions: a first new facility of its type on the principal living level or entrance storey must meet clauses 3.12.3 and 3.12.4, alterations must follow 3.12.3 as far as reasonably practicable, existing compliant accommodation must at least maintain its level of compliance after alteration, and may only be removed or relocated where at least equivalent facilities remain.
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The National Archives (legislation.gov.uk)
SI 1999 No. 1148, in three Parts: Part I Preliminary (regulations 1 to 2), Part II Requirements (regulations 3 to 6), Part III Enforcement (regulations 7 to 14). Regulation 4 requires water fittings to meet the standards set out in Schedule 2; regulation 5 sets the notification procedure requiring the water undertaker's consent before certain installations. Schedule 1 establishes the five fluid risk categories used to size backflow protection. Schedule 2 carries the detailed requirements on materials, watertightness, resistance to internal pressure, backflow prevention, hot water services, WC flushing devices, taps and appliances, including paragraph 7 that no water fitting shall be embedded in any wall. Schedule 3 revokes the former water byelaws.
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The National Archives (legislation.gov.uk)
The regulation that decides whether a tap, cistern, shower or appliance may lawfully be installed. Regulation 4(1) requires every water fitting to be of an appropriate quality and standard and suitable for the circumstances in which it is used, and requires it to satisfy at least one route: an appropriate CE marking under the Directive, conformity with an appropriate harmonised standard or European technical approval, conformity with an appropriate British Standard or another EEA national specification giving an equivalent level of protection, or conformity with a specification approved by the regulator. Regulation 4(2) requires every water fitting to comply with the requirements of Schedule 2 so far as they apply to it. Regulation 4(3) requires the work to be carried out in a workmanlike manner, satisfied by following a relevant British Standard or European technical approval, a specification approved by the regulator, or a method approved by the water undertaker. This is the statutory hook behind WRAS approval and the WaterRegsUK directory of approved products.
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The National Archives (legislation.gov.uk)
The statutory backflow duty that sits behind every check valve, tap gap and pipe interrupter in a house. Paragraph 15 requires that every water system shall contain an adequate device or devices for preventing backflow of fluid from any appliance, fitting or process. A device is adequate only if it conforms to a specification approved by the regulator for the purposes of the Schedule. The device fitted must be appropriate to the highest applicable fluid category to which the fitting is subject downstream before the next such device, which is the rule that forces a category 5 air gap on a bath or bidet with a flexible hose rather than a check valve. Backflow prevention is also required on supply or distributing pipes to prevent backflow between separately occupied premises, and wherever the water undertaker gives notice that it is necessary. The exemption is narrow: it does not apply to a water heater or vented storage vessel where the water temperature does not exceed 25 degrees C and expanded water can flow back into a supply pipe or cistern.
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The National Archives (legislation.gov.uk)
The water regulations half of the unvented hot water rules, the companion to Building Regulations requirement G3. Paragraph 17(1) requires that every unvented water heater, other than an instantaneous water heater with a capacity not greater than 15 litres, and every secondary coil contained in a primary system, must either be fitted with a vent pipe, a temperature control device, a temperature relief device and a combined temperature and pressure relief valve, or be capable of accommodating expansion within the secondary hot water system. That 15 litre threshold is the line that exempts a small under-sink or point-of-use heater from the full unvented package. Paragraph 17(2) requires an expansion valve to be fitted with provision ensuring that water is discharged in a correct manner should the expansion vessel or system malfunction, which is the statutory basis for the tundish and discharge pipe arrangement. Read it with Approved Document G3 in England, section 4.9 of the Scottish handbook and Technical Booklet P in Northern Ireland, all of which add installer competence and discharge routing requirements on top.
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The National Archives (legislation.gov.uk)
The paragraph that makes a permanently connected heating filling loop unlawful without the right device, and the one plumbers are most often challenged on. It states that no supply pipe or secondary circuit shall be permanently connected to a closed circuit for filling a heating system unless it incorporates a backflow prevention device in accordance with a specification approved by the regulator for the purposes of the Schedule. Central heating water is a fluid category 3 risk at minimum, and category 4 where inhibitors or other additives are present, so the approved device is normally a double check valve for category 3 or an RPZ valve for category 4, and the common flexible braided filling loop is intended to be disconnected after use rather than left in place. Read it with paragraph 15, which sets the general backflow duty and requires the device to match the highest fluid category downstream.
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The National Archives (legislation.gov.uk)
The legal source of the rule that the kitchen cold tap must be mains fed, and the exception people rely on when it is not. Paragraph 27 states that a drinking water tap shall be supplied with water from a supply pipe, a pump delivery pipe drawing water from a supply pipe, or a distributing pipe drawing water exclusively from a storage cistern supplying wholesome water. The third route is the important one: a tank-fed drinking tap is lawful only where the cistern itself supplies wholesome water, which in practice means a cistern meeting the lid, screen, material and maintenance requirements elsewhere in Schedule 2, and that is why a loft cistern of the traditional open type disqualifies the tap it feeds. Read it with paragraph 15 on backflow and with the WaterRegsUK guidance on drinking water taps, which recommends the tap be fed direct from the mains and not through any fitting that stores, treats or filters the water, and which is the reason a water softener installation leaves one tap unsoftened.
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The National Archives (legislation.gov.uk), UK Statutory Instrument 1998/2451
The legal bar on non room-sealed gas appliances in bathrooms and bedrooms, which is what decides whether a boiler can be moved into a bathroom or airing cupboard off one. Regulation 30(1) prohibits installing any gas appliance in a room used or intended to be used as a bathroom or shower room unless it is a room-sealed appliance. Regulation 30(2) prohibits a gas fire, other gas space heater or gas water heater of more than 14 kilowatt gross heat input in a room used or intended as sleeping accommodation unless it is room-sealed. Regulation 30(3) allows such an appliance of 14 kilowatt gross heat input or less, and an instantaneous water heater, in sleeping accommodation only where it is room-sealed or incorporates a safety control designed to shut the appliance down before a dangerous quantity of combustion products builds up in the room. Regulation 30(4) extends all three prohibitions to a cupboard or compartment within such a room, and to a cupboard, compartment or space adjacent to such a room if there is an air vent from it into the room.