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robl
@robl
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Honorable Member
Joined: Mar 23, 2022
Last seen: Sep 3, 2025
Profile Activity
Topics: 1 / Replies: 203
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Reply
RE: Vaillant Arotherm Plus issues - circulation, efficiency and performance

I suspect it is very common for installers to avoid using weather compensation, and instead set a constant high flow temperature. It makes for a quic...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Undersized ASHPs & Unbelievable energy bills

@cathoderay You could try turning all rad TRV's off except one, confirm that one works as expected, move through them all one by one? Our plumbin...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Undersized ASHPs & Unbelievable energy bills

@cathoderay Great the PHE seems to be ok! Any pipes outside clearly need to be lagged, but indoor ones probably not. Any pipework inside the ther...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Undersized ASHPs & Unbelievable energy bills

If you have a PHE, then there will be a temp drop between the two separate liquids, and this temp drop is what pushes the heat flow from one liquid to...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Undersized ASHPs & Unbelievable energy bills

Usually heat exchangers used in plumbing are bphe (brazed plate heat exchangers). They have two connections at each end, and should always be used in...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Undersized ASHPs & Unbelievable energy bills

@howiewsl There seem to be two issues: £5 a day It's not warm enough Taking the first of these - 'since you've a 5p/24p tariff, the number of...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Undersized ASHPs & Unbelievable energy bills

It’s a lot simpler to spec a gas boiler than an ashp. While there are similarities - modern examples of both have huge modulation ranges, so don’t ju...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat recovery systems

We had a vent axia HR25 for a few years, it worked quite well. It's a fan replacement unit, with heat exchanger - there are quite a lot on the market...

3 years ago
Forum
Well & Truly Off The Grid
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RE: Undersized ASHPs & Unbelievable energy bills

I'm sorry you're having trouble with it, I hope it can be made to work better. Apologies in advance for a flood of questions, which hopefully will he...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Wondering why BioGas is not promoted

I think an anaerobic digester has to run warm, and it uses some of the available organic material to keep itself warm. For that reason, it works bett...

3 years ago
Forum
Wood Burners, Biomass, Small Scale, Biofuels & Other Heating Alternatives
Reply
RE: DIY Heat Pump controller (driver)

About 4 months ago I finished our diy GSHP. I think your controller is much more sophisticated than the one I made - our house is very well insulated...

3 years ago
Forum
Grounds Source Heat Pump (GSHPs)
Reply
RE: Questions about V2G, V2H and V2Everything

We have a 30kWh Nissan Leaf with V2G on a trial by OVO, which we've been on for almost 2 years. The car is on our driveway connected by a Chademo con...

3 years ago
Forum
Renewable-powered transport (EVs & e-bikes)
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