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Squonk
@squonk
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Joined: Sep 2, 2022
Last seen: Mar 22, 2023
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Topics: 3 / Replies: 25
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RE: Vaillant flow rates, Delta T, buffer sizing - trying to get ASHP running well but hit a brick wall.

@iancalderbank Thanks, that's an interesting article. My installation matches Option 1 (the least efficient one) so there is clearly scope for improve...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Vaillant flow rates, Delta T, buffer sizing - trying to get ASHP running well but hit a brick wall.

That’s a good thought, I’ll need to work out how it should be, will try that when I’m next off work.

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Vaillant flow rates, Delta T, buffer sizing - trying to get ASHP running well but hit a brick wall.

@iancalderbank I assume it does have glycol … but I also assumed the guy knew what he was doing, and look where that got me! There are numerous other ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Vaillant flow rates, Delta T, buffer sizing - trying to get ASHP running well but hit a brick wall.

Thanks for the various answers. The tank is a 45l buffer, no immersion or anything else. I’m not sure it’s as simple as swapping the pipes at the pump...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Vaillant flow rates, Delta T, buffer sizing - trying to get ASHP running well but hit a brick wall.

Unfortunately where the pipes run under the floor would make it a very big job to trace the full length. The only pump in the system is in the UFH cir...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Vaillant flow rates, Delta T, buffer sizing - trying to get ASHP running well but hit a brick wall.

@derek-m That was my first thought, but I’m 100% sure it’s correct, which leads me to think the flow & return into the buffer could be the wrong w...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Vaillant flow rates, Delta T, buffer sizing - trying to get ASHP running well but hit a brick wall.

Just to follow on from this, finally got hold of the sensors (Shelly) and set them up on the buffer tank. This was the result: Any thoughts? ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Vaillant flow rates, Delta T, buffer sizing - trying to get ASHP running well but hit a brick wall.

Thanks for the suggestions. The trays are polystyrene with thin aluminium foil. As to the rest, I don't think any kind of heat loss calculations were ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant flow rates, Delta T, buffer sizing - trying to get ASHP running well but hit a brick wall.

Thanks Derek, that's a good suggestion. I've ordered another Shelly temperature monitoring module which will do the job, should be here in a few days,...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Vaillant flow rates, Delta T, buffer sizing - trying to get ASHP running well but hit a brick wall.
3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 30
Views: 10529
Reply
RE: Are there issues with Vaillant’s app?

I'm still using the Senso App, as others have said it's slow and flaky. Often get the super helpful 'Not Compatible' or 'There is a problem' on launch...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Is my Heatmiser UFH controller dying?
3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 0
Views: 1167
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