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Johnmo
@johnmo
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Prominent Member
Joined: Jan 25, 2023
Last seen: Mar 11, 2025
Profile Activity
Topics: 2 / Replies: 422
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Reply
RE: Draining and refilling ASHP.

Your heat pump will give you a water spec to follow. For reference this is what mine says

6 months ago
Forum
DIY
Reply
RE: Ecodan thoughts please: QUHZ-W40VA takes longer than I would like to revert back to heat mode following a DHW cycle

So I suppose the real question is you house cooling down to much or are temps ok? How is the circulation pump operated on all the time?

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Samsung Gen6 Room temp vs Outlet temp

To set up weather compensation or water law. You start with a base curve and them manipulate it over a period of time. Warm weather setting. At 20...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Circulatory pumps and weather compensation

If the pump is PWM controlled, flow rates will be adjusted automatically by the heat pump, most pumps aren't though. So you need to set the flow rates...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Moving from two zone to single (open) / how to select a circulation pump - advice please

You need to get an idea of pipe size and length and number of bends etc. Look at current secondary pump current settings. Where it sits speed wise....

6 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Minimum ASPH outputs?

I would be careful you don't fall down a rabbit hole. Modulation seems to vary massively with different heating systems, flow temp etc. irrespective o...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Moving from two zone to single (open) / how to select a circulation pump - advice please

Think you may be thinking too much. So first Has your heat pump got its own pump, if so the plan is to use that and not change it. So to enable t...

6 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: How to Solve Mould and Mildew Issues in Renovated Properties

MEV - Mechanical Extract Ventilation. A central extract unit, that takes damp air out of wet room (bathrooms etc). Demand flow rate, varies flow based...

6 months ago
Forum
Your Home
Reply
RE: How to Solve Mould and Mildew Issues in Renovated Properties

You need to ensure your house is pretty airtight ideally 3ACH or better at 50Pa. Otherwise you are just adding additional ventilation to and from the...

6 months ago
Forum
Your Home
Reply
RE: Determining correct flow rate for a heat pump

With UFH, no buffers or volumisers. Once you switch from DHW, the circulation pump runs until the return temp is within limits to allow restart. This ...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: British Gas versus Octopus: Two possible heat pump routes - how to evaluate them?

There are other methods, how many would want this? A rapid overnight test is carried out that essentially heats up your property overnight. Then in...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: British Gas versus Octopus: Two possible heat pump routes - how to evaluate them?

For exactly the same reason I gave in my example. As installed my boiler used twice the expected amount of gas. Main reason was too many thermostats, ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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