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Graham Hendra
Graham Hendra
@grahamh
Member Professional Installer
Estimable Member
Joined: Apr 14, 2021
Last seen: Oct 7, 2025
Profile Activity
Topics: 7 / Replies: 103
AllTopicsReplies
Topic
World’s Most Expensive Kettle: Undersized Heat Pump
2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 9
Views: 991
Topic
How Do Refrigerants Actually Work?
2 years ago
Forum
Well & Truly Off The Grid
Replies: 1
Views: 918
Topic
Do thick walls make for warm houses?
2 years ago
Forum
Insulation
Replies: 18
Views: 3330
Reply
RE: National heat pump day April 12th

I used 3305 kWhrs over the whole year and 1608 kWhrs by the 12th April. not bad huh? it was higher than expected in the first 4 months as it was supe...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Installation queries for Grant Aerona

@iancalderbank im no eco 4 expert i tend to steer well away from this sort of thing sorry

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: What do we need to know before installing a heat pump?

@derek-m to be honest i couldnt care less what they do. whatever happens there will be more paperwork and not a lot will happen.

3 years ago
Forum
Government Schemes, Regulations, Training, Planning & Organisations
Reply
RE: What do we need to know before installing a heat pump?

@ginny i was the founder of freedom. But i dont work there any more, i haven't for 2 1/2 years, i sold it. I got fed up of people constantly asking fo...

3 years ago
Forum
Government Schemes, Regulations, Training, Planning & Organisations
Topic
are their any nice easy to understand books on heat pumps, a shameless plug
3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 0
Views: 1748
Reply
RE: 12kW Samsung gen 6 short cycling

i like it, yes , short and sweet

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 12kW Samsung gen 6 short cycling

look i know its not what you want to hear but stop obsessing over the PWM output. Im afraid that most heat pumps dont really have a pwm function at al...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 12kW Samsung gen 6 short cycling

Ok so first never run the unit below 30 or even better 35c flow temp. You will get tons of cycling Heat pumps don't work well below these temperatu...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: National heat pump day April 12th

january was horrific this year, my run cost was roughly twice the average, thats global warming for you.

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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