Company lists · Data refreshed September 2026

Top 25 Radiant heating system suppliers based in the United Kingdom

Name: Radiant heating system suppliers based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 375 companies tracked

RevenueBase identified 375 radiant heating system suppliers headquartered in the United Kingdom as of September 2026 and tracks 4,609 professional contacts across them, including 1,174 with verified work emails. London is the largest hub.

This list covers radiant heating system suppliers headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 21, 2026 86% judged on-target in blind review

375Companies

4,609Contacts tracked

1,174Verified emails

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The 25 largest radiant heating system suppliers based in the United Kingdom

Ranked by team size

Top 25 of 375 radiant heating system suppliers based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to radiant heating system suppliers: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	BAXI	Partial evidence	Warwick, United KingdomHQ checked Sep 21, 2026	1,001-5,000	850 contacts →
	Partial evidence “We're leading the energy transition to zero carbon, by offering complete residential and commercial heating and hot water solutions.” Source: RevenueBase Database · checked Sep 21, 2026
2	Dimplex UK	Partial evidence	Southampton, United KingdomHQ checked Sep 21, 2026	501-1,000	201 contacts →
	Partial evidence “For over 75 years, Dimplex has been the trusted name for electric heating.” Source: RevenueBase Database · checked Sep 21, 2026
3	Vaillant UK	Partial evidence	Belper, United KingdomHQ checked Sep 21, 2026	501-1,000	179 contacts →
	Partial evidence “What does it take to deliver confidence at every stage of the heating journey?” Source: RevenueBase Database · checked Sep 21, 2026
4	Grant Engineering UK LTD	Strong evidence	Swindon, United KingdomHQ checked Sep 21, 2026	51-200	115 contacts →
	Strong evidence “We are a leading supplier of sustainable heating systems, including HVO boilers, air source heat pumps, solar thermal, hot water storage cylinders, aluminium radiators and…” Source: RevenueBase Database · checked Sep 21, 2026
5	Rointe Heating	Strong evidence	Peterborough, United KingdomHQ checked Sep 21, 2026	51-200	83 contacts →
	Strong evidence “With over 35 years of experience, and as Europe's leading manufacturer of electric heating, Rointe is ideally placed to help our customers choose the right heating system, at the…” Source: RevenueBase Database · checked Sep 21, 2026
6	Stelrad LTD	Strong evidence	Mexborough, United KingdomHQ checked Sep 21, 2026	201-500	75 contacts →
	Strong evidence “Celebrating our 90th anniversary, Stelrad is the UK market leader in central heating radiators, providing the most extensive selection of radiators in various sizes compared to…” Source: RevenueBase Database · checked Sep 21, 2026
7	Powrmatic Limited	Strong evidence	Ilminster, United KingdomHQ checked Sep 21, 2026	51-200	73 contacts →
	Strong evidence “Powrmatic is a leading manufacturer and solution provider of advanced HVAC systems, including warm air heating, radiant heating, electric and water-based systems, as well as…” Source: RevenueBase Database · checked Sep 21, 2026
8	Nu-Heat Underfloor Heating & Renewables	Strong evidence	Honiton, United KingdomHQ checked Sep 21, 2026	51-200	70 contacts →
	Strong evidence “As the UK's largest supplier of warm water underfloor heating and integrated renewables, Nu‑Heat delivers fully designed, energy efficient systems to installers, housebuilders…” Source: RevenueBase Database · checked Sep 21, 2026
9	Kartell UK LTD	Strong evidence	Bedford, United KingdomHQ checked Sep 21, 2026	201-500	56 contacts →
	Strong evidence “Founded in 2008, Kartell is the largest supplier of radiators, designer towel warmers and bathroom equipment to the independent merchant and showroom sector in the UK.” Source: RevenueBase Database · checked Sep 21, 2026
10	Alpha Heating Innovation	Partial evidence	Wrotham Heath, United KingdomHQ checked Sep 21, 2026	51-200	55 contacts →
	Partial evidence “Established over 50 years, Alpha is recognised today as one of the leaders in the UK’s heating industry.” Source: RevenueBase Database · checked Sep 21, 2026
11	WMS Underfloor Heating	Strong evidence	Brookmans Park, United KingdomHQ checked Sep 21, 2026	11-50	51 contacts →
	Strong evidence “Leading supplier and installer of underfloor heating for residential developments in the UK.” Source: RevenueBase Database · checked Sep 21, 2026
12	The Underfloor Heating Store	Partial evidence	Basildon, United KingdomHQ checked Sep 21, 2026	51-200	48 contacts →
	Partial evidence “We're the UK's most trusted and tried Underfloor Heating Brand.” Source: RevenueBase Database · checked Sep 21, 2026
13	Hamworthy Heating LTD	Strong evidence	Hull, United KingdomHQ checked Sep 21, 2026	51-200	45 contacts →
	Strong evidence “Hamworthy Heating is a British manufacturer and supplier of commercial heating and hot water products.” Source: RevenueBase Database · checked Sep 21, 2026
14	Elecro Engineering LTD	Partial evidence	Stevenage, United KingdomHQ checked Sep 21, 2026	11-50	45 contacts →
	Partial evidence “Elecro Engineering are considered one of the leading international manufacturers and specialists in the field of swimming pool water heating.” Source: RevenueBase Database · checked Sep 21, 2026
15	GDC Group LTD	Partial evidence	Southampton, United KingdomHQ checked Sep 21, 2026	51-200	43 contacts →
	Partial evidence “GDC is the holding company for some of the best known brands in the heating industry, including Dimplex, Creda NOBO, Faber, Robinson Willey, Valor, Wonderfire, Glen, Unidare…” Source: RevenueBase Database · checked Sep 21, 2026
16	Smith's EP UK	Strong evidence	Chelmsford, United KingdomHQ checked Sep 21, 2026	51-200	39 contacts →
	Strong evidence “Founded in 1991, Smith’s EP UK has grown organically to become the UK’s leading supplier of hydronic fan convector products, providing versatile, energy efficient heating…” Source: RevenueBase Database · checked Sep 21, 2026
17	SPC	Partial evidence	Leicester, United KingdomHQ checked Sep 21, 2026	51-200	39 contacts →
	Partial evidence “SPC is a British manufacturer specialising in supplying heating and cooling solutions.” Source: RevenueBase Database · checked Sep 21, 2026
18	Rapid Energy LTD	Indirect evidence	Sheerness, United KingdomHQ checked Sep 21, 2026	n/a	35 contacts →
	Indirect evidence “Established in February 2020, Rapid Energy is a dynamic business operating in the UK temporary HVAC sector.” Source: RevenueBase Database · checked Sep 21, 2026
19	Castrads	Partial evidence	Stockport, United KingdomHQ checked Sep 21, 2026	51-200	34 contacts →
	Partial evidence “Castrads, established in England in 2006, manufactures custom-built, custom-finished radiators as well as controls and fittings that are suitable for both steam and hydronic…” Source: RevenueBase Database · checked Sep 21, 2026
20	Ambiente Systems LTD	Strong evidence	Hatfield, United KingdomHQ checked Sep 21, 2026	11-50	33 contacts →
	Strong evidence “Ambiente Systems Ltd has been trading since 2006 and specialises in the design, manufacture and supply of hydronic underfloor heating systems to the trade.” Source: RevenueBase Database · checked Sep 21, 2026
21	Atag Heating Technology UK Limited	Indirect evidence	Dunfermline, United KingdomHQ checked Sep 21, 2026	51-200	31 contacts →
	Indirect evidence “BUILT TO LAST ATAG truly is a unique company.” Source: RevenueBase Database · checked Sep 21, 2026
22	Fastwarm Underfloor Heating	Strong evidence	Basildon, United KingdomHQ checked Sep 21, 2026	11-50	30 contacts →
	Strong evidence “FastWarm® are the UK's No 1 online supplier of Underfloor Heating products: with over 20 years’ experience in the industry, we've accumulated a comprehensive understanding of…” Source: RevenueBase Database · checked Sep 21, 2026
23	Gaia Underfloor Heating Specialists	Partial evidence	Bury St Edmunds, United KingdomHQ checked Sep 21, 2026	11-50	30 contacts →
	Partial evidence “Gaia Underfloor Heating.” Source: RevenueBase Database · checked Sep 21, 2026
24	Trust Electric Heating	Partial evidence	Leeds, United KingdomHQ checked Sep 21, 2026	11-50	29 contacts →
	Partial evidence “Trust Electric Heating is an industry-leading, electric heating company providing innovative, affordable and sustainable heating solutions to homes and businesses across the UK.” Source: RevenueBase Database · checked Sep 21, 2026
25	Wunda Group PLC	Partial evidence	Caldicot, United KingdomHQ checked Sep 21, 2026	51-200	29 contacts →
	Partial evidence “Wunda Group plc was established in 2006 as a leader in underfloor heating solutions specialising in providing energy efficient solutions with environmental ethics at their core…” Source: RevenueBase Database · checked Sep 21, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: radiant heating system suppliers. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names radiant heating system suppliers.
Partial evidence: Its own public description names part of radiant heating system suppliers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name radiant heating system suppliers. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 375 radiant heating system suppliers based in the United Kingdom

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Radiant heating system suppliers based in the United Kingdom at a glance

As of Sep 21, 2026

25.5%Verified-email coverage

12.3Average contacts per company

1-10Median size (employees)

4.8%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

187

11-50

112

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 375 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among radiant heating system suppliers, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “radiant heating system suppliers”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names radiant heating system suppliers), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among radiant heating system suppliers, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 1,174 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 21, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names radiant heating system suppliers, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many radiant heating system suppliers are there based in the United Kingdom?

RevenueBase identified 375 radiant heating system suppliers headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

BAXI, headquartered in Warwick, tops this list with the largest team on record.

Which city has the most radiant heating system suppliers?

London leads with 18 headquartered companies, followed by Manchester (8) and Bristol (7).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 1,174 verified decision-maker contacts tracked across these 375 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 21, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.