Boiling Mad: Exposing Radiatorgate - Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls

RE: Boiling Mad: Exposing Radiatorgate

DREI — Fri, 05 Sep 2025 11:45:30 +0000

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.

RE: Boiling Mad: Exposing Radiatorgate

Mars — Thu, 04 Sep 2025 08:51:25 +0000

@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.

RE: Boiling Mad: Exposing Radiatorgate

Rob Nezard — Thu, 04 Sep 2025 08:46:37 +0000

@editor thanks Mars. Yeah it is a real issue.

We are working to drive change through the market but it's a slow process.

We are actually pulling together case studies at the moment, @drei would you be open to working with us on this?

RE: Boiling Mad: Exposing Radiatorgate

Mars — Thu, 04 Sep 2025 08:36:22 +0000

@rob-nezard is the biggest expert I can think of in rads... what do you think Rob?

RE: Boiling Mad: Exposing Radiatorgate

DREI — Wed, 03 Sep 2025 22:27:42 +0000

Actually they do. My case is a prime example. Catalogue provided by my installers dated 2022 (January 2023 according to Adobe Metadata) output, vs same manufacturer catalogue dated late 2023 and latest 2025 are rated -28% less. So the fact that my installers used the 2022 brochure, is a factor to why my radiators are undersized, and each of my floors have around 33% shortfall. Do you still think manufacturers are not inflating figures?

RE: Boiling Mad: Exposing Radiatorgate

Rob Nezard — Sat, 10 Feb 2024 22:13:20 +0000

Hi Alec, thanks for your comment, I appreciate your perspective on this and you are correct that flow temperature affects output. This is why radiators are delta rated, so that it's clear that the radiator outputs different amounts at different temperatures. BSEN442 - the regulation that governs the manufacturer and sale of radiators, dictates that radiators must be tested by a notified body (BSRIA is the only one in the UK) and advertised using the rated thermal outputs at both Delta 50 and Delta 30. The problem with these radiators is that they are being advertised with heat outputs that far exceed the rated thermal outputs achieved during testing. So in these cases (and many others), yes the manufacturers are distorting the truth. If you have not done so, please watch the 7 minute documentary we produced (available on our website on the link above) as the evidence speaks for itself. Happy to chat further or answer any questions you may have. Thanks again Rob

RE: Boiling Mad: Exposing Radiatorgate

Alec Morrow — Sat, 10 Feb 2024 18:37:18 +0000

Both flow rates and temperatures affect output, and I doubt BSRIA has the technology to match them to design specifications.

Manufactures have failings but distorting the truth is not one of them.

their failings are that they don’t explain themselves, the “intellectual capital” around radiators performance is not explained. And people jump to the wrong conclusions.

RE: Boiling Mad: Exposing Radiatorgate

Rob Nezard — Thu, 08 Feb 2024 11:55:02 +0000

Hi Dave, the petition form is just above where the letter is but it does take a second to load.

RE: Boiling Mad: Exposing Radiatorgate

Mars — Thu, 08 Feb 2024 11:49:35 +0000

@Dave, this link takes you a page with the petition at the bottom: UK Radiators.com

6315

RE: Boiling Mad: Exposing Radiatorgate

Dave — Thu, 08 Feb 2024 11:18:28 +0000

Sorry, but where exactly is it possible to sign the petition? URL please. I can't find it; certainly not at the link you already gave - that seems to just link to a PDF.