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robl
@robl
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Joined: Mar 23, 2022
Last seen: Oct 27, 2025
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Topics: 1 / Replies: 204
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RE: Hybrid ASHP and gas boiler - operating together

As the boiler is just on/off at a given running temp, can you drop the temp down to the lowest acceptable, leaving it on most of the day (18hours+)? ...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hybrid ASHP and gas boiler - operating together

Do your gas boiler have weather compensation? If so, enabling it will improve efficiency. I assume the boiler is huge, and can operate at high power...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do thick walls make for warm houses?

@bontwoody A lot of the reason the u value doesn’t scale with 1/wall thickness is because in-situ insulation also includes air boundary layers. Tha...

11 months ago
Forum
Insulation
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RE: Excessive performance/system issues with GSHP

We have a small gshp, and in very cold weather the glycol out can be 0C, sometimes even -6C by the end of winter in a cold snap. Our rads run at 32C ...

11 months ago
Forum
Grounds Source Heat Pump (GSHPs)
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RE: Simulation of ASHP with Gas boiler as part of decision process

I’d recommend getting a smart meter, and asking for daily or finer data. The highest daily gas use in kWh, divided by 24, will be the smallest heatpu...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Octopus Intelligent Go Test Charge

I have an ohme commando plug charger, and I remember the test charge was a hassle with IO go. The smets 1 smart meter we have was stated as an issue ...

1 year ago
Forum
Electricity, Tariffs, Monitoring & Providers
Reply
RE: Is mine bigger than yours? Ambient level of consumption.

150W average overnight - in order that’ll be: fridgefreezer, mvhr, ftth router, water softener, loads of standby stuff. There’s no standby stuff tha...

1 year ago
Forum
Electricity, Tariffs, Monitoring & Providers
Reply
RE: Single vs. three phase for heat pump, EV and appliances

We’re all elec too, and on a 100A single phase fuse. I haven’t considered changing it to 3phase - it would be simple though to fit even more PV ...

1 year ago
Forum
Electricity, Tariffs, Monitoring & Providers
Reply
RE: DIY solar upgrade - Considering adding more panels

I made supports out of recycled plastic lumber, aluminium, and stainless screws for our flat epdm garage roof. The lumber is 40x40x3000mm from ‘filcr...

1 year ago
Forum
Solar Photovoltaic (PV)
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RE: New Fogstar 15.5kWh upright solution

Our hybrid inverter is a sunsynk, and while it states the SOC monitored by the (Seplos mason) battery I’m pretty sure it uses its own voltage measurem...

1 year ago
Forum
Energy Storage
Reply
RE: Comparing & Evaluating the Efficiency of Gas Heating vs. ASHP Powered by Gas-Fired Electricity

‘Natural’ gas energy content is usually given at the Lower Heating Value (LHV). This value is not the total chemical energy, but assumes all water cr...

1 year ago
Forum
Electricity, Tariffs, Monitoring & Providers
Reply
RE: Placement of Samsung R290 ASHP

The choice of refrigerant is always a compromise. So far as I'm aware, they are generally: Poisonous / High GWP / ozone depleting / flammable / sup...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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