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AllyFish
@allyfish
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Noble Member
Joined: Oct 31, 2022
Last seen: Feb 2, 2026
Profile Activity
Topics: 23 / Replies: 494
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Reply
RE: Grant 13kW Aerona3 - issues getting zones to temp

@jamespa the point is it allows variable secondary flow rates lower than the primary. In some circumstances that requires hydraulic separation where t...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant 13kW Aerona3 - issues getting zones to temp

Hi @Crimson. Hmm, this isn't surprising. When Grant are pushed they often revert to the default Aerona Schematics, which, by the addition of a lot of ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Octopus Cosy & Octopus EV + bidirectional smart tariff, together. What, eh?

Well, it sounded all too good to be true. And it was. After several months hanging on the waiting list, I finally poked Octopus into giving me an up...

4 months ago
Forum
Electricity, Tariffs, Monitoring & Providers
Reply
RE: Why Air Release Valves and Deaerators are Non-Negotiable

@old_scientist I had an automatic float type air vent on my old open heating system at the top of the circuit. It only had a small static head of abou...

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Why Air Release Valves and Deaerators are Non-Negotiable

We have a manual air release valve on top of the Grant Low Loss Header/volumiser. This is a good location as the velocity through the system is lowest...

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Large heat pump options for church building

Hi @josephiah, there's quite a good range of small commercial 3Ph electric heat pump units, or reversible chillers. Example:/span> Many use R290 pro...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Octopus Cosy Fixed

@howardp99 it might have saved me £8 compared to the price rise details announced 20th Sept. I didn't updated my spreadsheet with those. Were an all-e...

4 months ago
Forum
Electricity, Tariffs, Monitoring & Providers
Reply
RE: Octopus Cosy Fixed

I've singed up to the fixed Cosy Octopus tariff. The fixed 12month rate is currently slightly cheaper than the October 2025 Cosy price rise rate. it's...

4 months ago
Forum
Electricity, Tariffs, Monitoring & Providers
Reply
RE: Preparing for 2nd winter in new build house.

Hi @sbm74 - wow, 650m2 - that's a big pile! But, 60degC max flow temperature - eh, what, why? Building regulations also set the maximum design flow ...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat Pump Damage on install - useable or dealbreaker?

A few years ago all external condensing units and monobloc heat pumps had fairly robust protection grilles fitted to the coil face, which could be rem...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Help me keep the faith with my air source heat pump installation

Roof trusses and dry lined ceilings are a massive sounding board. This is a very common issue with sparks who screw bathroom extract fans direct to ro...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Who’s Caved and Switched the Heating On Already?

Central heating still switched off and will be until October. The Octopus Cosy account has built up a good credit over the summer, but I have over a t...

5 months ago
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