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Boiling Mad: Exposing Radiatorgate

Rob Nezard · 2024-02-08T08:20:19Z

Imagine buying a car advertised as reaching 30 miles per gallon, only to discover it barely manages 10. Now, imagine that happening not just with your car, but with your radiators, and that the "overstated mileage" translates to higher heating bills and missed climate goals. This shocking reality is playing out right now across the UK. Misleading Metrics Many consumers assume UK regulations safeguard against false advertising. Unfortunately, when it comes to radiator heat output, that's not the case. Millions of radiators are sold annually with inflated heat claims, often exceeding 25% of the actual output. This discrepancy isn't a minor quibble; it impacts heating efficiency, leading to higher bills and missed Net Zero targets. The Investigation Begins To uncover the truth, we purchased five radiators from five different UK websites, each acclaimed for their high heat outputs. The objective was simple: test these radiators at a regulated lab and compare their actual heat outputs to those advertised. We drove the rads to BSRIA (Building Services Research and Information Association), a leading authority in testing, who conducted the evaluations. Their testing environment – a specialised, unventilated booth with water-cooled surfaces – ensures accuracy, free from external environmental influences. Radiators were measured and tested over an 8-hour period, with continuous data collection. Spoiler Alert The results, when they arrived, were as bad as we had anticipated, and in some cases, even worse, leaving us unsurprised yet deeply concerned: Radiator 1: Advertised output: 953 Watts (3250 BTUs); Actual output: 760 Watts (2592 BTUs); Overstated by 25% Radiator 2: Advertised output: 1026 Watts (3500 BTUs); Actual output: 786 Watts (2680 BTUs); Overstated by 31% Radiator 3: Advertised output: 927 Watts (3160 BTUs); Actual output: 738 Watts (2517 BTUs); Overstated by 26% Radiator 4: Advertised output: 988 Watts (3371 BTUs); Actual output: 716 Watts (2442 BTUs); Overstated by a whopping 38% Radiator 5: Advertised output: 889 Watts (3034 BTUs); Actual output: 712 Watts (2428 BTUs); Overstated by 25% A Widespread Issue Beyond Sample Size The results from these five radiators are a small representation of a much larger issue plaguing the UK radiator market. With millions of units potentially sold with exaggerated heat outputs, the economic and environmental impact is profound. Consumers face higher bills, and the nation's Net Zero targets become harder to achieve due to increased energy wastage. These findings also raise critical questions about regulatory enforcement and consumer protection. The overstated outputs not only lead to financial losses for consumers but also betray the trust placed in regulatory compliances and standards. The Need for Urgent Action Our investigation underscores a pressing necessity for government and regulatory intervention. It's imperative that regulations are not just present, but vigorously upheld to safeguard consumer interests and maintain the integrity of the market. This issue transcends mere deceptive sales practices; it touches upon the wider ramifications for energy efficiency and the stewardship of our environment. The radiator heat output scandal in the UK is a wake-up call for consumers, businesses and regulators alike. It underscores the importance of rigorous testing and transparent marketing. As consumers, it's vital to stay informed and demand accountability. Sharing this article, supporting the petition below and calling for regulatory action are steps we can take to bring about change. Together, we can confront this issue, protect consumer interests and contribute to a more sustainable future. We would like to call upon the readers and members of Renewable Heating Hub to actively spread the word about this vital concern. Please share this article and support our petition for regulatory reform at UK Radiators.com. Your voice can make a difference in bringing an end to this deceitful practice and paving the way for a more honest and efficient market.

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Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls

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Mars

(@editor)

Illustrious Member Admin

Joined: 5 years ago

Posts: 3421

04/09/2025 9:51 am

@rob-nezard you can see more of Drei's rad dramas here as part of his overall bodge: https://renewableheatinghub.co.uk/22000-heat-pump-disaster-that-exposes-a-broken-industry/

And I'm sure @drei will be up for it... Drei let me know if you'd like me to connect you to Rob via email.

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DREI

(@drei)

Eminent Member Contributor

Joined: 3 weeks ago

Posts: 19

05/09/2025 12:45 pm

Hi @Rob,
I’d be more than happy to contribute. I have the original emails from my installer with the 2022 catalogue attached, as well as the later 2023 catalogue and the current 2025 version from Kartell’s website. Heat Geek actually recommended using UKRadiators.com instead of others precisely because of their MARC membership, which makes this all the more relevant.

I’ve also tracked down the 2021 (not 2022) and 2023 brochures online:

2021 – Kartell Catalogue, p.4 (MJ Bathrooms)2023 – Kartell Designer Radiators, p.4For reference, my radiators are K-Rail Aspen models.
Taking one of my installed models as example:
Double Column ASP60-115DW 600 x 1140

2021 output: 8,6452023 output: 6,223→ A 39% reduction.

That is a staggering discrepancy. In fairness, I can almost forgive my installers for the shortfall in design, because they used what they were given at the time. Then again, maybe they should have checked against the 2023 brochure, even so, Kartell’s shifting figures are the main root of my problem, with the poor buffer use and configuration second.
In my case there was no need of a buffer, or just a small up to 10l volumiser, because the pipe going from the heat pump to the property is about 18 meters, and they did not take that in consideration part of the Samsung’s 50l water volume requirement.

In my view, installers like mine should be pursuing a claim against Kartell, especially if I’m not the only customer facing radiator shortfalls caused by these catalogue inconsistencies.

This post was modified 3 days ago by DREI

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