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Johnmo
@johnmo
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Noble Member
Joined: Jan 25, 2023
Last seen: May 21, 2025
Profile Activity
Topics: 2 / Replies: 527
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RE: Hybrid ASHP and gas boiler - operating together

I have a home brew hybrid system (didn't want to scrap a nearly new boiler). Found the best cost wise was is to switch over from ASHP to gas when you ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Solar thermal with combi boiler

ASHP - air source heat pump PDHW - priory demand hot water. So heating the hot water cylinder on priority over heating, but more importantly allows...

4 months ago
Forum
Solar Thermal & Power Diverters
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RE: Solar thermal with combi boiler

When I had the combi connected as per a combi (now system conversion, ASHP hybrid), it was run as preheat of the cold water prior to entering the comb...

4 months ago
Forum
Solar Thermal & Power Diverters
Reply
RE: Adding underfloor heating to existing HP system

Generally no, because it increases the downward heat losses - you dT between floor and ground is higher. Not necessary to zone, but to make it ru...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Advice please re-instating a condensing gas boiler to ASHP once fitted

It pretty simple to hybridise any heat pump. I did a self funded ASHP install and had a 2 year old boiler, which I didn't see the point in selling for...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Recommended ASHP protection fluid products

I recently removed all the anti freeze from the system, and cleaned to VDI 2035 spec, so very clean water with low conductivity. No anti freeze valv...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ECODAN ASHP General Set-up and efficiency.

Not the best option for ventilation! You will end up with a house that hot and stuffy, the stuffy feeling isn't because it's hot, its rubbish air qual...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Emptying our Aira system while radiators and pipes are moved?

If it's for domestic heating systems it's not toxic at all. It's not the same as car antifreeze. The chemist used in a domestic heat system is Food ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan thoughts please: QUHZ-W40VA takes longer than I would like to revert back to heat mode following a DHW cycle

That may be your issue. You have hot water sitting in, I assume is an insulated pipe, so it will not cool quickly. If your pump runs when ever there i...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Draining and refilling ASHP.

Your heat pump will give you a water spec to follow. For reference this is what mine says

7 months ago
Forum
DIY
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RE: Ecodan thoughts please: QUHZ-W40VA takes longer than I would like to revert back to heat mode following a DHW cycle

So I suppose the real question is you house cooling down to much or are temps ok? How is the circulation pump operated on all the time?

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Samsung Gen6 Room temp vs Outlet temp

To set up weather compensation or water law. You start with a base curve and them manipulate it over a period of time. Warm weather setting. At 20...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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