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JamesPa
JamesPa
@jamespa
Moderator
Illustrious Member
Joined: Apr 3, 2023
Last seen: Oct 4, 2026
Topics: 27 / Replies: 5447
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RE: Next steps on my ASHP journey: Radiators and Pipework

Surely the drops to the radiators are in parallel not in series, so the index circuit for pressure drop calculations will be determined by the longest...

4 weeks ago
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RE: Where heat loss surveys seem to go against practical reality

I have one Mitsubishi Ilife2-slim fancoil to solve a problem that otherwise would have required either a large K3 or a superlarge K2. Its really quit...

4 weeks ago
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RE: Surface mount or bury primaries for heat pump installation?

@tomasmcguinness Has it changed colour between photos or is that just the evening light?

1 month ago
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RE: Where heat loss surveys seem to go against practical reality

@ian33a Given the nature of your house I think you did well to get estimates that close. I have to agree with this sentiment: and also The...

1 month ago
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RE: vaillant aurotherm - Using Heating

Mine does the same, but recordw is only about 6kWh/month. I assume its a combination of quiescent power consumption, some of the things it does reg...

1 month ago
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RE: Missing flow temperature in Heat Geek proposal

I can imagine 'get outs' but doubt they will use them. Heat Geek do appear to be 'industry leading' in offering this guarantee, and everything we hea...

1 month ago
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RE: Missing flow temperature in Heat Geek proposal

Quite probably, does the guarantee come with any definitions of terms   Quite possibly yes, albeit perhaps surprisingly. Here is a plot f...

1 month ago
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RE: Problems with sizing a replacement for a Viessmann Vitocal 200-S

Good but - with your recirculating pump a high proportion of our DHW consumption is actually heating the house! Best to bear that in mind!

1 month ago
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RE: Problems with sizing a replacement for a Viessmann Vitocal 200-S

@cathoderay if I could give two thumbs up for that post I would. However pressing the thumbs up a second time deletes the first. I concede that this...

1 month ago
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RE: Problems with sizing a replacement for a Viessmann Vitocal 200-S

I would agree with this if it were not for the material discrepancy with this graph (the flattening off of which at low temperatures can be explained ...

1 month ago
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RE: Problems with sizing a replacement for a Viessmann Vitocal 200-S

Ah. If the 'secondary pump' means a water circulation pump, that explains the very high apparent DHW usage. If so its not actual water usage, its en...

1 month ago
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RE: Next steps on my ASHP journey: Radiators and Pipework

I don't for certain. There are a couple of possible installer parameters namely conf heat build pump, unit %pwm, default auto, but can be set 50%-1...

1 month ago
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