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Johnmo
@johnmo
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Prominent Member
Joined: Jan 25, 2023
Last seen: Mar 11, 2025
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Topics: 2 / Replies: 422
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RE: Simulation of ASHP with Gas boiler as part of decision process

Be careful with that assumption - why The CoP includes many things a gas boiler efficiency doesn't. A gas boiler doesn't include any electric inputs...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Simulation of ASHP with Gas boiler as part of decision process

Mostly depends on your circulation pump head losses etc. from pipe length and number of bends etc. There are ways around things. Buffers are looked as...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

If you want to take advantage of the £7500 grant, you are subject to MCS calculation methods, so simulation or otherwise is pretty much a waste of tim...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Simulation of ASHP with Gas boiler as part of decision process

But that isn't the best way to run a heat pump. Weather compensation run 24/7 and if you need a very small nighttime setback of a couple of degrees on...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Balancing financial efficiency and comfort using the Octopus Cosy tariff

So some observations A setback or off period your heat pump will have to play catchup at the end of that period to replace the energy lost. But the...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Antifreeze Valves

Not correct, if you use inhibitors or glycol then VDI 2035 is not applicable to your system. You are using a different system. My heat pump instructio...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Antifreeze Valves

Think you need a lot of hours to cause any issues. There is an article on here suggesting 12 or hours in a freezer. A slow drip overnight is quit...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: The good, the bad and the not that great – my heat pump installation

If you have a buffer you have a primary and secondary circuit. The primary circuit is the ASHP and buffer. Your flow sensor is in the primary circuit ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Antifreeze Valves

I went a completely different route VDI2035, no antifreeze valves. System run WC mode all the time, circulation pump always on. Have battery so mi...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: The good, the bad and the not that great – my heat pump installation

But with soak away also, otherwise you will have a big chunk of ice that gets deeper every day below zero. I would remove soil under gravel Wh...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Looking for help with a Mitsubishi FTC2BR controller

Just to show you what occurs when you switch from DHW heating - max flow temp 60 degs. Within about 40 secs the flow temperature drops from 60 to ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Looking for help with a Mitsubishi FTC2BR controller

Maybe not the most efficient way to run your heat pump. Your trimming is just done by balancing the loops. Instead of off or on commands from the ther...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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