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Old_Scientist
@old_scientist
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Prominent Member
Joined: Jun 16, 2024
Last seen: Jan 9, 2026
Profile Activity
Topics: 6 / Replies: 315
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RE: My house is too big and the Vaillant 7kW heat pump can't heat it when temperatures drop below 4C

There was a recent thread over on the openenergymonitor forum discussing the issue of Vaillant 7kW unit not being able to deliver anywhere near 7kW (s...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Unvented Hot Water cyclinder 300l 50c vs 60c

It might do, try it and see? As the majority of your usage is showering, where the hot water will be blended down to ~38C, heating it hotter should ...

11 months ago
Forum
Domestic Hot Water & Cylinders
Reply
RE: DHW Efficiency

Estimating COP for DHW is complicated by the fact that the flow temperate is not constant, but rises steadily over the heating cycle. Manufacturers ...

11 months ago
Forum
Domestic Hot Water & Cylinders
Reply
RE: Hot water tank losing temp overnight.

In the summer you can see another problem, where the pumps will run after 24h of inactivity to prevent pump seizure. This can be a pain if you have a ...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Optimising DHW in summer (once heating season ends)

Yes, I already run in the Samsung equivalent Quiet Mode for DHW, which limits output to around 70% and which is more efficient. Now I'm looking at t...

11 months ago
Forum
Domestic Hot Water & Cylinders
Topic
Optimising DHW in summer (once heating season ends)
11 months ago
Forum
Domestic Hot Water & Cylinders
Replies: 2
Views: 1043
Reply
RE: Hot water tank losing temp overnight.

My Samsung system does the same, and it's due to the Samsung Anti-Freeze protection feature. When the OAT is below 5C (risk of freezing) AND the sys...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Tomato Energy

Surely it is not beyond the capabilities of a government department to sit down with the relevant bodies to weed out the projects that are never going...

11 months ago
Forum
Electricity, Tariffs, Monitoring & Providers
Reply
RE: buffer/volumizer cupboard space eater, do i need one?

As you say, short cycling can occur during milder ambient conditions where the flow temps are reduced and the radiators/emitters then cannot dissipate...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Increasing Demand on my Electricity Supply

With respect to the original topic in this post, back in the summer I had a 12kW ASHP (permitted development) and 3.645kWp solar array with 3.0kW inve...

11 months ago
Forum
Your Home
Reply
RE: Increasing Demand on my Electricity Supply

Thank you! The solar uptake seems high at 33.3%. The numbers may well be higher, as I know at least one of my neighbours has battery storage, whic...

11 months ago
Forum
Your Home
Reply
RE: Increasing Demand on my Electricity Supply

@transparent Thank you for the great explanation, and for the exchanges today - really appreciate your help in gaining a better understanding of the i...

11 months ago
Forum
Your Home
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