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Had to replace my GSHP due to new regulations with an ASHP

Murchison2003 · 2023-01-15T11:20:44Z

Hi I’ve just found this forum by accident but reading some of the stuff on here already, seems like a good place to be with really helpful comments and help from people. I’ve recently replaced my ground source heatpump I’ve had for the past 14 years with a Vaillant Arotherm plus 12 kw as I couldn’t swap the ground source pump due to new regulations ( I would have needed to install a further 300m ground loop to comply) . I’m finding the running costs a bit higher with the air source but still trying to play with the settings to achieve max efficiency. I have solar generation with 20 kw of battery storage, ev and charge from home almost all of the time. I am on an ev tariff which I am most grateful for as I’d hate to imagine what my bills would be without it. Can I ask anyone on here if they too have transitioned from ground to air and have you noticed any difference in any way. Thanks in advance.

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Ground Source Heat Pump (GSHPs)

Last Post by Murchison2003 4 years ago

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Murchison2003

(@murchison2003)

Active Member Member

Joined: 4 years ago

Posts: 22

Topic starter 10/02/2023 4:26 pm

It’s been at 0.4 since Tuesday, I’ve increased it this morning to 0.5 just to see if I can see any difference in temperatures and / running costs for a few days

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Sapper117

(@sapper117)

Trusted Member Member

Joined: 5 years ago

Posts: 49

11/02/2023 7:13 am

@murchison2003 thanks I’ve just noted you did say that! Old age!!

we are set at 1.2 but I have two 7kwh Callie TD one acting as DHW and slave to the second which is the main heat. I am not sure if I adjust the heating pump what I should do to the slave especially as everything has worked well for 11 months

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Murchison2003

(@murchison2003)

Active Member Member

Joined: 4 years ago

Posts: 22

Topic starter 11/02/2023 7:24 am

Every house is different but from what I’ve seen so far 1.2 seems a bit high. But if it’s working and you’re happy with it don’t change it.
I changed my settings yesterday, curve is at 0.5 now and see a difference but it is 9.5 deg at the moment. Saw the efficiency at 5.2 during the night and has dropped back to 4.8 at the moment. Temp due to drop tomorrow night to just above zero so will monitor that to see how it fairs.
what efficiency are you seeing with your current settings?

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Sapper117

(@sapper117)

Trusted Member Member

Joined: 5 years ago

Posts: 49

11/02/2023 8:30 am

@murchison2003 not too happy re fiddling with the system and valient dont make most user friendly systems but our historic SCOP is sitting at 3.53 going back to last week in feb last year. I am certainly saving money on my old LPG and wood burner i recon we are over £1k saved plus the house never drops below 17.5 and 19.5 daytime I'm retired so here all day. With 8kwh ground based sp with 9.5 kwh battery just in we are currently pulling in 10kwh per day (early feb!!) so hope savings will all add up

this is all in a 60% 200+ yr old scottish random stone 5 bed cottage.

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