ASHP Scotland Retrofit

AdamM · 2023-10-03T21:58:55Z

Hello everyone, I am considering replacing oil boiler with ASHP but a lot of estimates upfront and mixed reviews from those who went for ASHP. My EPC is C on an edge with D so not so bad for ASHP. However, i can see that there is so many different factors to consider and trying to reassure myself that retrofit is a right way to do. Please can anyone who swapped oil boiler to ASHP in Scotland could share the following? - How accurate Heat Loss calculation was vs running ASHP, particularly annual SCOP and running cost. - During colder spells, did ASHP manage to maintain the temperature. - What is the annual maintenance cost? - What was your annual oil heat demand (ca you share oil boiler model) vs annual kWh used by the ASHP (please provide ASHP model). Wonder if assuming ASHP heat demand based on oil consumption is accurate due to a different way of operation i.e. oil on demand vs ashp continuous - Any other things worth sharing? - If you could turn the time back, would you do it again or kept/upgrade oil boiler? Thank you

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Air Source Heat Pumps (ASHPs)

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GordonEngland

(@gordonengland)

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07/10/2023 4:57 pm

@allyfish Thanks for posting this . Your situation is very comparable to mine her just north of the Border in Berwickshire.

wanting to move from our Grant condensing oil boiler to a Vaillant or new Octopus Cosy 6 HT ASHP. Encouraged by the £9k grant we get here! Already on 4KW PV backed by a 9.5kwh GE battery. As an experiment I bought a 2nd Sunamp 10kwh heat battery early in Summer to divert the spare solar Fantastic ! , saved 500 litres of oil used for summer water heating. Want now to get a Sunamp that can twin with a HT heat pump and be charged thermally as well as by electricity/solar. Hoping to avoid rad changes as far as poss. We are on EPC C despite it being a whinstone built house 600mm thick! With no wall or floor insulation but DG and loft Ins. South facing though. Thanks for your helpful info!

bill

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GordonEngland

(@gordonengland)

Active Member Member

Joined: 2 years ago

Posts: 5

07/10/2023 9:03 pm

@allyfish Can I ask how large is your PV array and the battery size. Do you charge the battery(s) in both Cosy time periods?

lastly roughly how kWh does your HP draw per hour over the 17 hours?

I have a 137 Sq m stone end terraced ,3 beds house with 14 rads was using 1200-1500 l of oil ,but cut to perhaps 800 due to the Sunamp.

busy speccing & costing a HT HP 6 - 7 kw solution with a 10kwh Sunamp and an appropriate tariff regime. Thinking 22 - 24 kWh of peak grid via Cosy & 9.5 kWh battery( charged in both periods) might yield similar results to yours. Need another 5kwh just for household use . HP not needed in warmer months at all perhaps as we had free hit water and electricity May to August.

Bill G

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