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Thinking of ripping our my IVT Greenline HT Plus C model and replacing with a gas boiler.

abbote · 2025-01-05T16:47:55Z

We designed and built our own house around a GSHP in 2011, because we wanted to do the right thing, even though we had mains gas. This year it has developed many issues and alarms and has finally now stopped working. With sub-zero outside weather I'm rather desperate! No one seems to know anything about it, I'm over £500 down just having 3 separate 'expert' heating engineers stand there and let me shown them how it works and them to scratch their heads and walk away and send me a bill. On top of this it took me a while just to get someone to come and look at it, we had no heating in November. Is there anyone out there that can help? The main issue seems to be a HTF alarm (GT8/GT9) and then a HTF max which trips the unit out. I'm told there should be a particulate filter but cannot find it, I know it's not in the inside of this model, so it might never have been fitted. I increased the alarm threshold and lowered the water temperature to force the pump to drop into rad heat in order to get heating into the house. This was in November, and it's limped through to now, but the GT8 temp has increased to over 70 with a GT9 at sub 30, and with water temperature of only 40. Now cannot get it to jump to rad heat. If I try add heat to get it to cycle the water temp to over 60, then a electrical cassette alarm triggers. Alto Energy have been quite helpful and have told me to drain the system and check the flexible hoses below the electrical cassette, but this is beyond my abilities and when I have suggested this to the heating engineers, then don't seem keen either? I have been given a quote to install a Worcester Bosch gas boiler and HW tank, it's quite eye watering after spending £25k on a system I thought we would get 20-30 years out of, however, it's a lot cheaper than a replacement GSHP. Its a fact that there are more engineers out their that understand gas boilers, and very few that are either interested or have knowledge of heat pumps. On top of this the increase in electricity/kWhr has really also enforced my belief that we are just not ready to heat our homes with this technology.

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Ground Source Heat Pump (GSHPs)

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JamesPa

(@jamespa)

Illustrious Member Moderator

Joined: 3 years ago

Posts: 4864

11/06/2025 9:13 pm

Posted by: @greenlight

↑

Should be a minimum sentence of 3 years behind bars for anyone who replaces a geothermal (assuming a good collector) with an air to water 🤣.
I’ve 6,000 plus customers with both geo and air to water on my service books and hands down geothermal is more reliable.

That's great and in principle I wouldn't disagree, but if someone is being quoted 18K to fix a heating system then I can fully understand their reluctance (and surely you can also) - that's just silly money, particularly as the part that is actually faulty probably costs no more than £500.

This post was modified 11 months ago 2 times by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.

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