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robl
@robl
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Honorable Member
Joined: Mar 23, 2022
Last seen: Jul 30, 2025
Profile Activity
Topics: 1 / Replies: 203
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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...

7 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...

9 months ago
Forum
Insulation
Reply
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 ...

9 months ago
Forum
Grounds Source Heat Pump (GSHPs)
Reply
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...

11 months 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 ...

11 months 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...

11 months 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 ...

12 months 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)
Reply
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)
Reply
RE: Placement of Samsung R290 ASHP

Compared to having ‘natural’ gas piped continuously into a home -a permanent gas source, the tiny amount of r290 kept safely in a heatpump for many ma...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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