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Old_Scientist

@old_scientist

Member

Honorable Member

Joined: Jun 16, 2024
Last seen: Apr 26, 2026

Topics: 6 / Replies: 399

AllTopicsReplies

RE: Why One Strike on Iran’s Oil Infrastructure Undermines Every Heat Pump and Solar Array in Britain

Why? Factor in 85% efficiency for that oil boiler and you're looking at more like 14p/kWh. Therefore, a heat pump with a COP of 4 (easily achievab...

2 months ago

Forum

Well & Truly Off The Grid

RE: Why One Strike on Iran’s Oil Infrastructure Undermines Every Heat Pump and Solar Array in Britain

Unfortunately this tale of woe perfectly illustrates why removing the link to gas prices in the UK system won't result in cheaper electricity prices a...

2 months ago

Forum

Well & Truly Off The Grid

RE: Why One Strike on Iran’s Oil Infrastructure Undermines Every Heat Pump and Solar Array in Britain

Same here - I record the price of oil on the 1st of each month in my spreadsheet and work out what my break even price for electricity would be given ...

2 months ago

Forum

Well & Truly Off The Grid

RE: Fitting a volumiser to an existing system

All very reasonable. During 2 winter's of usage, I only recall 1 defrost cycle occurring during the DHW cycle, probably a result of always trying to r...

2 months ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Fitting a volumiser to an existing system

@jamespa Sorry, I've checked and am unable to find a system schematic showing a volumiser in any of my Samsung documentation (I thought it did). The...

2 months ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Fitting a volumiser to an existing system

Whilst I generally agree with the above, it can be manufacturer specific. For example, my Samsung heat pump will take heat from whichever cycle is a...

2 months ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Why One Strike on Iran’s Oil Infrastructure Undermines Every Heat Pump and Solar Array in Britain

@morgan A friend of ours told us they placed an order with Boiler Juice just before the conflict and Boiler Juice cancelled the order a couple days la...

2 months ago

Forum

Well & Truly Off The Grid

RE: Other than heat loss, radiator sizing, ASHP sizing, what else goes into a design and how important is it?

Indeed. My point was that if you design for a flow temp of 50C at -3C based on a 10kW heat loss, and in reality the heat loss is more like 7kW then yo...

2 months ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Other than heat loss, radiator sizing, ASHP sizing, what else goes into a design and how important is it?

@petch just wondering how your averaged heat loss survey data compares to actual usage data. Is your existing boiler gas, and if so do you have access...

2 months ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Other than heat loss, radiator sizing, ASHP sizing, what else goes into a design and how important is it?

@petch Yes, if the flow and return pipes immediately split into 22mm runs for upstairs and downstairs, then each branch should theoretically be able t...

2 months ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Other than heat loss, radiator sizing, ASHP sizing, what else goes into a design and how important is it?

All great advice 👍 Going back to radiators and pipework sizing, once you have a heat loss calculation, broken down room by room, you can st...

2 months ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Heat Pump vs New Gas Boiler for Inherited House - Worth the Extra Cost?

Hi @fretless6 Mike, I have experience with Taggas (Retford), as they installed my system (a 12kW Samsung unit) on an ECO4 grant. The design proces...

2 months ago

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