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JohnR
@johnr
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Estimable Member
Joined: Nov 25, 2024
Last seen: Apr 8, 2025
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Topics: 0 / Replies: 106
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RE: Not a good January? My heat pump used 840 KWh of electricity

1970's 4 bed detached house with loft and cavity insulation in central southern England heated by a 7kW Vaillant Arotherm+. 508kWh used in January acc...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Looking for some advice – no viable installer/system – I'm stuck

This situation provides a good example of the challenges of retro-fitting heat pumps to existing housing. Is there a technical reason for not fitting ...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is My Midea Heat Pump Inherently Defective?

Would bigger emitters compensate for the lower water temperature in the cooler rooms? Something extra in the living room might be sufficient as some h...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ecodan flow rate tweak

1. Are all your radiator valves (both any thermostatic valves and the lockshield valves) fully open? 2. What diameter is your pipework to the radiat...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Insulating brass fittings in Loft

Here's a couple of thermal images of my cylinder and pipework which have turned what was the coldest room in the house (NE corner) into the warmest de...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat Pump starting current

I caught my Arotherm+ heat pump at the end of a defrost cycle this morning when the OAT was about 0C. I then checked the data provided by the Vaillant...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: What's Your Heating Identity? From Eco-Tech Savvy to No Choicer

I probably fit into the Eco-tech savvy group with the heat pump investment helped by the current government support. However, as a retired engineer, I...

4 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: Mixing of pipework/components' with different internal dimensions - theory vs reality/practical approach

It seems to be normal practice to put the filter on the return pipe to the heat pump so it catches any debris from the main heating system before it g...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mixing of pipework/components' with different internal dimensions - theory vs reality/practical approach

I've just been and checked: My 28mm pipework includes a 22mm mag filter (with isolator valves) and works fine. Think of it as a short section of singl...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mixing of pipework/components' with different internal dimensions - theory vs reality/practical approach

That looks to me to be a sound approach: Use the bigger pipe size to where the flow splits to the two heating circuits.

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mixing of pipework/components' with different internal dimensions - theory vs reality/practical approach

Less friction means less effort by the pump. The primary circuit for my 7kW Arotherm+ heat pump uses 28mm pipe and is running happily. The extra volum...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mixing of pipework/components' with different internal dimensions - theory vs reality/practical approach

The hydraulic friction losses are in proportion to the square of the flow velocity x length. For example the friction loss of a given flow through 22m...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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