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JamesPa
JamesPa
@jamespa
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Joined: Apr 3, 2023
Last seen: Oct 27, 2026
Profile Activity
Topics: 28 / Replies: 5534
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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!

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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 ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Next steps on my ASHP journey: Radiators and Pipework

The DT will be what the DT will be, its determined by the equations you set out above. This means that most of the time (with a constant flow rate li...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Next steps on my ASHP journey: Radiators and Pipework

  I think the above says it. There is no hard and fast rule about velocity and of course bends, particularly elbows, are going to matter mo...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 7kW EV Charger Options Advice

I replaced a regular 3 pin socket with an EV rated one. The regular one got hot, the EV rated one didn't.

2 months ago
Forum
Renewable-powered transport (EVs & e-bikes)
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RE: 7kW EV Charger Options Advice

Interestingly mine (vchargd) has a Bluetooth connection for the installer that does not appear to rely on any cloud. One of the installer settings is...

2 months ago
Forum
Renewable-powered transport (EVs & e-bikes)
Reply
RE: Problems with sizing a replacement for a Viessmann Vitocal 200-S

All agreed. I was suggesting degreedays.net as an (alternative) source of data that appears to come from actual, identifiable, weather stations &nb...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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