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Johnmo

@johnmo

Member

Prominent Member

2312 kWhs

Joined: Jan 25, 2023
Last seen: Mar 11, 2025

Topics: 2 / Replies: 422

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RE: Split system and pipe lengths for air source heat pump installation

Poor wording by me. Meant to say go mono-bloc heat pump so everything stays outside. A split system can move all the noisy stuff inside the house.

4 weeks ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Split system and pipe lengths for air source heat pump installation

In general no, the amount of air drawn through unit means it gets the air temperature not any localised warming. Front of house is within permitted de...

4 weeks ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Solar thermal with combi boiler

This is the part I actually used, it has a mixer valve as part of the assembly

3 months ago

Forum

Solar Thermal & Power Diverters

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 ...

3 months ago

Forum

Air Source Heat Pumps (ASHPs)

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...

3 months ago

Forum

Solar Thermal & Power Diverters

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...

3 months ago

Forum

Solar Thermal & Power Diverters

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...

4 months ago

Forum

Air Source Heat Pumps (ASHPs)

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...

5 months ago

Forum

Air Source Heat Pumps (ASHPs)

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...

5 months ago

Forum

Air Source Heat Pumps (ASHPs)

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...

5 months ago

Forum

Air Source Heat Pumps (ASHPs)

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 ...

6 months ago

Forum

Air Source Heat Pumps (ASHPs)

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...

6 months ago

Forum

Air Source Heat Pumps (ASHPs)