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.

Page 3 / 3 Prev

Ground Source Heat Pump (GSHPs)

Last Post by JamesPa 6 months ago

25 Posts

9 Users

5 Reactions

4,005 Views

RSS

JamesPa

(@jamespa)

Illustrious Member Moderator

Joined: 3 years ago

Posts: 3703

11/06/2025 8:13 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 6 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.

ReplyQuote

Page 3 / 3 Prev

26 Forums
2,342 Topics
53 K Posts
274 Online
6,000 Members

Forum Icons: Forum contains no unread posts Forum contains unread posts

Topic Icons: Not Replied Replied Active Hot Sticky Unapproved Solved Private Closed

RE: Help with heat pump sizing

@amin I dont think materially relative to t...

By JamesPa , 1 hour ago
RE: Melpump Users Anywhere?

Totally agree. The problem lies with what I was once ...

By Majordennisbloodnok , 1 hour ago
RE: Solcast thoughts.....

@majordennisbloodnok I have decided to take the plunge....

By TechnoGeek , 2 hours ago
RE: LiFePO4 lithium battery fires and explosions

I too had spotted the Na-ion battery and matching inver...

By Transparent , 4 hours ago
RE: Poll for Time of Use, tariffs, technology

You are absolutely right. I think another common fac...

By JamesPa , 7 hours ago
RE: Are We Sleepwalking Into Another Race to the Bottom?

Let' start with first thing first, HG is a startup, the...

By ksim , 7 hours ago
RE: Configuring third party dongle for Ecodan local control

@sheriff-fatman might be interested in this, f...

By F1p , 8 hours ago
RE: Commencing on an ASHP Installation Process

Fair play for giving this a go, and please do report ba...

By benson , 10 hours ago
RE: Different dT on each radiator?

I cant sorry. Its based on some calculations I did fro...

By JamesPa , 20 hours ago
RE: Setback savings - fact or fiction?

Maybe this: or maybe that the effect you are seein...

By JamesPa , 21 hours ago
RE: Help me keep the faith with my air source heat pump installation

@simonf thats interesting as I’ve noticed my flow and r...

By AdamK , 1 day ago
RE: MELcloud scheduling misbehaviour

No, it gets to set temperature easily even during perio...

By Abernyte , 1 day ago
RE: Free Ecoheat Heat Pump Install

Sorry hit 'add reply' too early, this forum layout will...

By Deltona , 1 day ago
RE: The Battery Battle

And arguably even more important, sodium will be hopefu...

By Batpred , 1 day ago
RE: A Smarter Smart Controller from Homely?

I've been thinking of emailing Homely to ask for a few ...

By JohnnyB , 2 days ago
Max output of Heat pump (Daikin 4Kw EDLA04)

Hello, I am a bit puzzled that according to pcdb tes...

By GeorgeA , 2 days ago
RE: Has Anyone Else Noticed a Decline in Tradesmanship?

@cathoderay Hence my rider about ‘all else being equal’...

By Toodles , 2 days ago
RE: Heat Pump Performance Analysis Web App using Modbus Data

@redzer_irl — all my heat pump data is in csv files, me...

By cathodeRay , 2 days ago

Forums

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

Join Us!

Worth Watching

Latest Posts

Members Online