Company lists · Data refreshed September 2026
Top 25 On-demand water heater companies based in the United Kingdom
RevenueBase identified 70 on-demand water heater companies headquartered in the United Kingdom as of September 2026 and tracks 2,178 professional contacts across them, including 430 with verified work emails. London is the largest hub.
This list covers on-demand water heater companies 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 20, 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.
The 25 largest on-demand water heater companies based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 850 contacts → | ||||
Strong 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 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 179 contacts → | ||||
Partial evidence “What does it take to deliver confidence at every stage of the heating journey?” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 53 contacts → | ||||
Strong evidence “Mixergy develop smart and connected hot water tanks which enable households to live better, save money, and reduce their impact on the environment.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 45 contacts → | ||||
Strong evidence “Hamworthy Heating is a British manufacturer and supplier of commercial heating and hot water products.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 45 contacts → | ||||
Strong 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 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 45 contacts → | ||||
Partial evidence “For over 40 years, Vokèra has been a trusted name in home heating across the UK and Ireland, delivering reliable, energy efficient solutions for domestic and light commercial…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 40 contacts → | ||||
Strong evidence “Lochinvar designs, manufactures and distributes a comprehensive range of high efficiency gas fired water heaters and boilers for commercial and industrial applications.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 31 contacts → | ||||
Indirect evidence “BUILT TO LAST ATAG truly is a unique company.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 28 contacts → | ||||
Strong evidence “STIEBEL ELTRON UK is a leading manufacturer of premium heat pumps and renewable heating solutions, electric hot water and room heating and ventilation, supplying high-quality…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 26 contacts → | ||||
Strong evidence “M&N Heating & Plumbing is an independent company based in Bloxham on the edge of Banbury, serving Oxfordshire, Northamptonshire, Buckinghamshire and Warwickshire.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 25 contacts → | ||||
Strong evidence “Strebel is one of Europe's leading suppliers of commercial heating and hot water solutions.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 24 contacts → | ||||
Indirect evidence “With more than 50 years of industry experience, Adveco Ltd.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 19 contacts → | ||||
Indirect evidence “Hyco Manufacturing Ltd has been established for over 20 years and is a West Yorkshire based manufacturer and distributor of electrical equipment specialising in serving the…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 12 contacts → | ||||
Strong evidence “The Electric Heating Company have developed their product portfolio to accommodate almost any Central Heating and Hot Water requirement.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 12 contacts → | ||||
Strong evidence “Ariston is the global expert in water heating and thermal comfort.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 12 contacts → | ||||
Strong evidence “Formed in 1982, Lord Combustion Services specialise in the design, installation, repair and maintenance of sustainable heating and hot water systems, supporting over businesses…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 10 contacts → | ||||
Strong evidence “ACV has been designing, manufacturing and distributing heating and hot water products for commercial and residential heating applications since 1922.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 10 contacts → | ||||
Indirect evidence “Founded by Dante Ferroli in 1955, with offices in San Bonifacio, near the Italian city of Verona, Ferroli controls a global business with factories in Europe and Asia.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 8 contacts → | ||||
Partial evidence “Trianco is revolutionising and de-carbonising homes by designing and manufacturing electric boilers, air source heat pumps and infrared panels.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 4 contacts → | ||||
Partial evidence “At Archergas® we have over 100 years combined experience of the British heating industry and as a result, we strive to offer the highest attainable standard of customer service…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 3 contacts → | ||||
Indirect evidence “Wondering who we are?” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 3 contacts → | ||||
Strong evidence “Dexpro offer a range of premium quality Electric Water Heating, Hand Dryers and Space Heating, supplying the Electrical Wholesale and Plumbers Merchants markets.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 3 contacts → | ||||
Strong evidence “Providing whole of house hot water and heating solutions - with smart technology.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 2 contacts → | ||||
Strong evidence “DKL Mechanical Limited provide a range of mechanical services for commercial and industrial applications, specialising in the design and manufacture of Heating and Hot Water…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 2 contacts → | ||||
Indirect evidence “Our story began in 1992 where the business started from owning one small van in Leicester for carrying out boiler works to a fully-grown business trading for 25 years.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
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: on-demand water heater companies. 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 on-demand water heater companies.
- Partial evidence
- Its own public description names part of on-demand water heater companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name on-demand water heater companies. 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 70 on-demand water heater companies based in the United Kingdom
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On-demand water heater companies based in the United Kingdom at a glance
As of Sep 20, 2026Companies by employee count
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 70 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 on-demand water heater companies, 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 “on-demand water heater companies”. 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 on-demand water heater companies), 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 on-demand water heater companies, 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, 430 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 20, 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 on-demand water heater companies, 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 on-demand water heater companies are there based in the United Kingdom?
RevenueBase identified 70 on-demand water heater companies 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 on-demand water heater companies?
London leads with 6 headquartered companies, followed by Farnborough (3) and Rotherham (3).
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 430 verified decision-maker contacts tracked across these 70 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 20, 2026.
Ready to reach these companies? Verified emails and direct dials for all 70 on-demand water heater companies based in the United Kingdom. Start with a free account, no credit card.
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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.
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