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AllyFish
@allyfish
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Joined: Oct 31, 2022
Last seen: Jun 18, 2025
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Topics: 22 / Replies: 468
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RE: Peering over the ASHP cliff

Welcome! I have a similar sized house, EPC C, 1992, 4 bed detached. Formerly CH and HW from Kerosene, which was actually cheaper per kWh than mains ga...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ASHP cage, surround or protection

Condensate drains could have been routed through the concrete pad to drain into the hardcore substrate underneath. A 50mm core cutter would have made ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Electricity price predictions

@editor I got the same, but for my mother's retirement flat, which is an account in my name. She only has electricity available to her. Her daytime ta...

3 years ago
Forum
Electricity, Tariffs, Monitoring & Providers
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RE: Massive Electricity Cost

The Grant/Chofu ASHP controller does not show if Weather Compensation is enabled or not from the 'home screen' display, you need to enter installer le...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat Pump Truth or Myth#1 - Keeping it running 24/7 uses less energy

I've tried running 24/7 with 18degC general space temperature. Lounge is boosted with a log burner the trickles heat upstairs too. It has been very co...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Another 17kw Grant Heat Pump - Advice Needed!

@bn06amp I'm afraid I can't spot it either there! It depends on where it is on the circuit, you don't need a bypass on the primary (ASHP) side with a ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Another 17kw Grant Heat Pump - Advice Needed!

@bn06amp that's all encouraging. The Grant pre-plumbed cylinder has an auto bypass, and Grant show it on their recommended installs. They are designed...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: MCS Certified Installer ?!

Hi @parmstar Have you any final % payment agreed upon receipt of installation documentation? What has the installer said regarding timely supply of MC...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Another 17kw Grant Heat Pump - Advice Needed!

@bn06amp my secondary pump is the Grundfos UPS3:130 which gives me 1.6m3/h (26l/min) at about 5m head set to maximum speed/curve. The primary pump in ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Flow rate issues?

For a typical 5degK delta T between flow and return, to provide 11kW you ideally need 11/(5x4.2) = 0.524l/s or 31l/min. Suggest the flow needs to incr...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Another 17kw Grant Heat Pump - Advice Needed!

@bn06amp ah, having the secondary hot water pump on a timer is a good idea, to only use when needed. You're right about the ASHP and hot water demand,...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Another 17kw Grant Heat Pump - Advice Needed!

@bn06amp yes, with a thermometer (you can buy little digital ones with small probes) check the temperatures are comparable across the top pipes and th...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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