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AllyFish
@allyfish
Contributor
Noble Member
4216 kWhs
Joined: Oct 31, 2022
Last seen: Mar 20, 2025
Profile Activity
Topics: 22 / Replies: 457
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Reply
RE: Peering over the ASHP cliff

The HIVE main thermostat overrides steady ASHP control if it's switching on and off. You can tell if it is from the HIVE app temperature graph. The HI...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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 ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

2 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...

2 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...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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 ...

2 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...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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 ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

2 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,...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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