Heating, Plumbing & Electrics
367 sources in the library on heating, plumbing & electrics, 35 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 4 of 10.
- supplier figure RN-AF1DQT cited
Samotech
A UK lighting-controls maker's wiring guide. It explains that UK loop-in lighting takes the neutral to the fitting, not the switch, which is why most switch positions lack a neutral.
Cited in Smart Lighting Systems Explained.
- supplier figure RN-8XZVI6 cited
Screwfix
Screwfix product page for a hard-wired 1080p video doorbell; it gives the current and previous shelf prices including VAT for a standard wired model.
Cited in Video Doorbells Compared.
- supplier figure RN-FINYMF cited
Screwfix
Screwfix product page for a white twin switched socket with two 65 W USB-C Power Delivery ports, priced at £27.99 including VAT; it sets the low end of the dual USB-C band.
Cited in USB & Smart Sockets.
- supplier figure RN-PTRUTZ cited
Screwfix
Retailer product page for a typical twin 4 ft LED batten sold for garages and workshops, giving its rated output of 4,400 lumens at 4,000 K. Cited only for the product's light output.
- supplier figure RN-YKIRZ3 cited
Screwfix
the retail price Screwfix publishes for Prysmian 6943X Black 3-Core 2.5mm2 Armoured Cable 10m Coil, which is the supply figure the cost book records for this item
- supplier figure RN-VT9ZC8 cited
Screwfix
Screwfix product page for Ring's hard-wired doorbell with a 2K camera; it gives the shelf price including VAT for a standard wired model from a major brand.
Cited in Video Doorbells Compared.
- supplier figure RN-EBJT9L cited
Screwfix
Screwfix, Time Cat 6 Purple LSZH 4-Pair 8-Core Unshielded Ethernet Cable 305m Box. Held in the cost register as a price source; the passage quoted against it reads: Time Cat 6 Purple LSZH 4-Pair 8-Core Unshielded Ethernet Cable 305m Box :: £151.69
Cited in Home Networking & Data Points.
- supplier figure RN-WQ5TEO cited
Screwfix
Screwfix product page for a 2K battery video doorbell; it gives the shelf price including VAT, which sets the low end of the basic battery band.
Cited in Video Doorbells Compared.
- supplier figure RN-L280R7 cited
SimplySafes
A specialist retailer's product page for a single EN 14450 S2 safe with an electronic lock, rated at £4,000 cash and £40,000 valuables, priced at £399. It backs the top of the £100–£400 S1/S2 band.
Cited in Home Safes: Types & Ratings.
- supplier figure RN-F02V5C cited
Sold Secure
Sold Secure's own account of its origin and ownership: set up by two police forces with Home Office backing, now owned and run by the Master Locksmiths Association.
Cited in Smart Locks & Keyless Entry.
- supplier figure RN-GEHGVO cited
Stelrad
Stelrad's product and technical sheet for its Classic and Classic Mini towel rails, giving EN 442 heat outputs at ΔT50 (75/65/20 °C) for each height and width in white and in chrome.
- supplier figure RN-WL3NLJ cited
Stelrad
The manufacturer output tables that radiator sizing depends on. Stelrad states that t50 is the UK industry standard for heating outputs, with an operating temperature of 75/65/20C, and directs users on a low temperature heat source to the t40 or t30 tables instead. At 450mm height and 1000mm length the delta T50 output is 756 W for a K1 single panel single convector, 1055 W for a P+ single panel double convector and 1371 W for a K2 double panel double convector. At 450mm by 1200mm the figures are 907 W, 1266 W and 1645 W. At 300mm by 1000mm they are 509 W, 745 W and 982 W. At 600mm height by 400mm length they are 392 W, 538 W and 693 W. Panel depths are 61mm for K1, 77mm for P+ and 100mm for K2, with total wall projections of 83mm, 101mm and 124mm. Heated surface area runs 2.09 to 9.15 m2 per metre and weight 9.31 to 40.53 kg per metre depending on type and height. Lengths run 300mm to 3000mm. The t50 caveat is the important part: a heat pump running at 45C flow will not get these numbers.
Cited in How to Bleed & Balance Radiators.
- supplier figure RN-W8QXYE cited
Stelrad
The maker's Delta T correction table. It gives factors of 0.604 at Delta T 34 and 0.846 at Delta T 44, which is 15% to 40% below the Delta T50 rating.
- supplier figure RN-1S9C1C cited
Stelrad
A radiator maker's explainer on Delta T. It defines Delta T as mean water temperature minus room temperature and says Delta T50 is the UK standard for quoted outputs.
Cited in Radiators Explained: Types, BTU Sizing & Cost, Restoring Cast Iron Radiators, Room-by-Room Radiator Sizing.
- supplier figure RN-YLGQPZ cited
Stelrad
A radiator maker's guide to panel type codes. It maps K1 to Type 11, P+ to Type 21 and K2 to Type 22, and gives the panels and fins in each.
- supplier figure RN-DWPPEH cited
The Radiator Company
A radiator supplier's guide explaining that dual-fuel installations need a T-piece so an element and a valve share one connection, or a dual-fuel TRV with integrated T-piece.
- supplier figure RN-YQYY03 cited
Toolstation
Toolstation's product page for a 47 mm two-gang dry-lining back box. It shows a price of £1.59 including VAT, supporting the note's figure of around £2.
Cited in USB & Smart Sockets.
- supplier figure RN-1FTF2F cited
Toolstation
A national retailer's product page for a basic twin USB-A double socket. It gives the USB ratings as 1.2 A on one port and 2.4 A on the other, showing the modest output of USB-A-only sockets.
Cited in USB & Smart Sockets.
- supplier figure RN-ZB4PH5 cited
Toolstation
A national retailer's product page for a Crabtree double socket with two USB-A charger ports. It rates the USB ports at 2.1 A and states a 35 mm minimum box depth.
Cited in USB & Smart Sockets.
- supplier figure RN-0RGLYM cited
Toolstation
A national retailer's product page for a domestic LED PIR floodlight. It gives an adjustable on-time of 10 seconds to 10 minutes, a 0 to 10 m detection range and an adjustable lux setting.
Cited in Security Lighting & PIR Sensors.
- supplier figure RN-AIOLE4 cited
Toolstation
Toolstation's product page for an MK Logic Plus double socket with 30 W USB-A and USB-C ports. It shows £31.30 including VAT, a branded mid-range price within the band.
Cited in USB & Smart Sockets.
- supplier figure RN-LZ7TLP cited
Toolstation
Toolstation product page for a 25 m coil of Pitacs 2.5 mm² 3-core steel wire armoured cable at £53.99 including VAT, about £2.16 per metre supplied.
Cited in Outdoor Sockets & Garden Power.
- supplier figure RN-O136RH cited
Toolstation
the retail price Toolstation publishes for pitacs twin earth cable 6242y grey, which is the supply figure the cost book records for this item
- supplier figure RN-7IX7WH cited
Toolstation
Toolstation's product page for a 20 W, 2,400 lm IP65 LED floodlight with PIR sensor. It shows £12.49 including VAT, the low end of the corrected supply price band.
Cited in Security Lighting & PIR Sensors.
- supplier figure RN-OHZTD5 cited
Toolstation
Toolstation's product page for a Wessex double socket with one USB-A and one USB-C port. It shows £12.99 including VAT, the low end of the USB-A and USB-C price band.
Cited in USB & Smart Sockets.
- supplier figure RN-ZARKB5 cited
Uponor
A manufacturer's design manual for underfloor heating. It lists the maximum floor surface temperatures used in EN 1264 design: 29 °C occupied area, 35 °C edge zone and 33 °C bathrooms.
Cited in Floor Insulation Materials & Build-ups, Underfloor Heating Manifolds & Controls.
- supplier figure RN-E2SVSE cited
Varilight
A UK dimmer maker's FAQ on its dimmers. It says the V-Pro Smart Wi-Fi dimmer installs in place of a standard switch with no neutral connection.
Cited in Dimmer Switches: Types & Compatibility.
- supplier figure RN-0CS75J cited
Varilight
A UK dimmer maker's troubleshooting FAQ. It recommends swapping to a trailing-edge dimmer where a lighting load makes a dimmer buzz excessively.
Cited in Dimmer Switches: Types & Compatibility.
- supplier figure RN-A6MFDX cited
Varilight
A UK dimmer maker's table of minimum wall box depths by product range: 25 mm for dimmers in its classic ranges and 35 mm in its Ultraflat range.
Cited in Dimmer Switches: Types & Compatibility.
- supplier figure RN-QNHGSI cited
Victorian Plumbing
A bathroom retailer's range page for towel rail heating elements, showing common element ratings of 150, 300 and 600 W and advising matching to the rail maker's specification.
- supplier figure RN-JDRDBP cited
Victorian Plumbing
A large UK bathroom retailer's valve guide explaining that angled, straight and corner valves suit different pipe runs and that H-block valves are for centrally connected radiators.
- supplier figure RN-0ZBP58 cited
Yale
Yale's UK page listing its smart alarm and camera subscription plans and monthly prices: the Alarm Plan with cellular backup at £5 a month and the Secure Pro plan with manned 24/7 monitoring at £29 a month.
Cited in Home Alarm Systems: Types & Cost.
- supplier figure RN-08REYE cited
Zehnder Group UK
A radiator maker's explainer: outputs are tested to EN 442 and published at ΔT 50 °C, with ΔT defined as mean water temperature minus room temperature.
- supplier figure RN-VNM63T cited
Zehnder Group UK
A leading MVHR manufacturer's product page stating its systems recover up to 96% of the heat from extracted air, a product performance claim.
- secondary RN-OLJWGB cited
Checkatrade
Checkatrade's cost guide for adding a plug socket to a room, updated June 2026 and, it says, verified by estimators who are members of the RICS and the CIOB. Held for the band it puts on adding a socket to an existing circuit, single, double or USB alike, and for the UK average inside it. A quote aggregator's own estimate, so an order of magnitude rather than an independent measurement.
- very strong RN-UM90J1
Dwr Cymru Welsh Water
WALES and parts of England, since Dwr Cymru Welsh Water's operating area crosses the border. You must notify Welsh Water if extending over or within THREE METRES of a public sewer or lateral drain, across a network of more than 30,000 km of sewers. An application is unlikely to be accepted where the sewer's internal diameter exceeds 225 mm or the pipe is deeper than 3 metres, and a greater standoff may then be required; commercial extensions and new detached structures need a sewer diversion instead. Nothing may be built over or near water mains or pressurised sewers. There are two routes, self-certification against set criteria and a full application with technical assessment. The published charges are £278.10 for consent by letter with no network alterations, £936.85 for consent by letter after alterations, and £1,053.00 for consent by legal agreement, covering administration, any site inspection, technical support, liaison with building control or the approved inspector, and issue of the consent. Work must not start until consent is given, and sewer traces are strongly recommended before excavating. Accessibility adaptations get extra support via the Build Over Sewers team on 0800 917 2652.
- very strong RN-R54RCK
Department for Business and Trade
Published 31 March 2026, last updated 21 August 2026, and applying to England, Scotland and Wales. States that the UK continues to recognise the CE marking alongside or in place of the UKCA marking for the Great Britain market under the Product Safety and Metrology (Amendment) Regulations 2024, so a CE marked product remains lawful to place on the GB market and manufacturers may choose either route. Sets out the UKCA and CE regimes spanning over 20 product types, and the duties of each economic operator: the manufacturer designs and marks the product, applies identification details (name, trade name or trademark and postal address) and retains the technical documentation. Northern Ireland uses CE or CE and UKNI marking instead, and the UKCA marking does not apply in Guernsey, Jersey, the Isle of Man or the British Overseas Territories.
- very strong RN-8XFMI0
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.
- very strong RN-L6C7A7
Health and Safety Executive
Regulation 36A of the Gas Safety (Installation and Use) Regulations 1998 requires a landlord to arrange an annual gas safety check within 12 months of a new appliance or flue being installed and annually thereafter. Only a Gas Safe registered engineer may carry out the maintenance and the safety check. The record must be kept for 2 years, given to existing tenants within 28 days of the check and to new tenants before they move in. Under the 2018 Amendment Regulations the check may be carried out up to 2 months before the due date while keeping the original deadline date, so the anniversary does not drift.
- very strong RN-1PUNR2
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.