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AllyFish
@allyfish
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Joined: Oct 31, 2022
Last seen: Aug 20, 2025
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Topics: 23 / Replies: 471
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RE: Another 17kw Grant Heat Pump - Advice Needed!

@bn06amp my secondary pump is the Grundfos UPS3:130 which gives me 1.6m3/h (26l/min) at about 5m head set to maximum speed/curve. The primary pump in ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Flow rate issues?

For a typical 5degK delta T between flow and return, to provide 11kW you ideally need 11/(5x4.2) = 0.524l/s or 31l/min. Suggest the flow needs to incr...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Another 17kw Grant Heat Pump - Advice Needed!

@bn06amp ah, having the secondary hot water pump on a timer is a good idea, to only use when needed. You're right about the ASHP and hot water demand,...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Another 17kw Grant Heat Pump - Advice Needed!

@bn06amp yes, with a thermometer (you can buy little digital ones with small probes) check the temperatures are comparable across the top pipes and th...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 17kw Grant Aerona heat pump not performing

@soniks thanks for that, the in-built pump in the Grant Aerona 17kW can provide 50l/min at 5m head on the highest speed setting. A Wilo Pico RP25/80 i...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: EBAC re-entering the ASHP market in 2023

@hughf EBAC make a decent UK washing machine, we have one, it's got an impressive 10year warranty. Not the most refined machine on the market but very...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
EBAC re-entering the ASHP market in 2023
3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 9
Views: 3112
Reply
RE: Another 17kw Grant Heat Pump - Advice Needed!

Hi Ash, welcome. Underfloor has a lot of thermal lag, it will take a day or so to get the thermal mass up to temperature. You should be able to get aw...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant arotherm plus 7KW electric usage

Hi Jon, we're all looking at our smart meters and wincing right now. The outdoor temperature is close on 10degC below seasonal average, so ASHPs are s...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 17kw Grant Aerona heat pump not performing

@soniks have you details of the second circulation pump fitted? Maybe a photo or something? Have you a flow setter / gauge on the system or any way of...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 17kw Grant Aerona heat pump not performing

@soniks That's useful stuff. Is the 44deC supply typical? The 12degK between your supply and return water temperatures is revealing. That suggests to ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 17kw Grant Aerona heat pump not performing

@cathoderay Yes, understood. My home heat loss estimate for the current weather averaging -1degC outdoor air temperature is 6kW or 144kWh per day. Add...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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