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Johnmo
@johnmo
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Noble Member
Joined: Jan 25, 2023
Last seen: May 23, 2025
Profile Activity
Topics: 2 / Replies: 535
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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...

8 months ago
Forum
Your Home
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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...

8 months ago
Forum
Your Home
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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 ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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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, ...

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

That's a lot of water, think I have 60L in my 195m² slab.

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

As discussed on another thread you could get in a situation where it's rubbish in and rubbish out. You need comparative data in all circumstances, the...

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

I know the solar gain is the reason. My point not made well enough, is all this data is being gone though based on OAT, IAT and kWh input. A week of s...

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

Sorry that my be true for straight glycol but not the correctly specified antifreeze for heating systems. One example being from Screwfix (many others...

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

I have been looking at data for my heat pump, it's just a mine field. Sun being behind thick cloud or thin cloud seems to be enough to throw results o...

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

Lucky me paid about £20 including postage. I only good data from this month. As that is when I got all the monitoring working together. My issue is ...

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

Or pick up a heat meter, we plumbed it in while we had the gas boiler, used it to optimise settings of the boiler and UFH. Luckily for me, I got one n...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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