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Saz

@saz

Member

Reputable Member

Joined: Sep 15, 2021
Last seen: Mar 17, 2025

Topics: 3 / Replies: 116

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RE: Circulation pump issues

@derek-m I've turned the whole system off now as that pump starting to make strange noises and I was getting quite freaked out. This does however mean...

4 years ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Circulation pump issues

Hi Derek, It's a Vaillant Arotherm plus. The ciculation pump is a Wilo. The UFH is off, and so are the rads, so I don't get why it's even running, t...

4 years ago

Forum

Air Source Heat Pumps (ASHPs)

Topic

Vaillant Arotherm Plus issues - circulation, efficiency and performance – heat pump horror story

4 years ago

Forum

Air Source Heat Pumps (ASHPs)

Replies: 106

RE: My ASHP Installation

@mikefitz Hi, and these systems shouldn't need to even use the immersion at this time of year I think? It's a good idea to do comparisons, that's what...

4 years ago

Forum

Air Source Heat Pumps (ASHPs)

RE: My ASHP Installation

I had the electrician back out today to look at the immersion, as I had reported it coming on alongside the heat pump during regular heating of the ho...

4 years ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Is my heat pump correctly sized?

Oh no @editor Am I right in thinking you have the Arotherm plus also? I'm using a portable radiator and boiling kettles again at mo until this immersi...

4 years ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Is my heat pump correctly sized?

Hi @KevM It was installed by an accredited installer but I don't understand why they sized this pump at 5kW when my old Dimplex was 12kW. It is a hig...

4 years ago

Forum

Air Source Heat Pumps (ASHPs)

Topic

Is my heat pump correctly sized?

4 years ago

Forum

Air Source Heat Pumps (ASHPs)

Replies: 12

RE: My ASHP Installation

There are quite large areas of floor that feel cold underfoot so I do suspect a problem. The system has replaced an old Dimplex ASHP and I don't remem...

4 years ago

Forum

Air Source Heat Pumps (ASHPs)

RE: My ASHP Installation

Thanks @editor and @derek-m I have the uniSTOR 200lt tank and I think the pump is a Wilo Circulation pump? The noise is quite difficult to describe,...

4 years ago

Forum

Air Source Heat Pumps (ASHPs)

Vaillant Aerotherm plus

Hi all, I've recently had a 5kW Vaillant Aerotherm plus installed (3 bed new build) which runs DHW and UFH/rads. The hot water side appears to work ...

4 years ago

Forum

Air Source Heat Pumps (ASHPs)

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