Forums

Search with Wattson
Forums
Members
RobS
Activity
 
Notifications
Clear all

Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!

RobS
@robs
Member
Estimable Member
Joined: Oct 15, 2024
Last seen: May 5, 2026
Profile Activity
Topics: 0 / Replies: 128
AllTopicsReplies
Reply
RE: Setback savings - fact or fiction?

Hi @sunandair We also have a Mitsubishi Ecodan but we also have OEM's energy monitoring kit installed, so have access to data with far greater accu...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Advice for a novice on Mitsubishi Ecodan 6kW

Hi @green_fox As a we have a PUZ-WM80VAA with FTC7 (the 8kW R290 Ecodan) I might be able to add some Mitsubishi specific info...   As J...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Setback savings - fact or fiction?

Good graphs @cathoderay but is the axis labelling wrong? X-axis (0-18) should be OAT and y-axis (0-10) COP? Interesting that the COP advantage of cont...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Setback savings - fact or fiction?

@cathoderay yes I am familiar with SQL. Interesting numbers... If there was no setback we have 4.12 kWh and a mean COP of 5.21, so energy in of 0.791 ...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Setback savings - fact or fiction?

Hi @cathoderay - this is a good discussion! I feel like we might be making some good progress in answering the fundamental setback question.   ...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Setback savings - fact or fiction?

Hi @cathoderay The 13kWh is as they say my bad, I was calculating 3 hour periods for the reheat and mistakenly only multiplied by 3 here, so 13 ...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Setback savings - fact or fiction?

The predicted values are based on assumptions and it is these assumptions that need testing IMHO. Your 9-10 April graph shows that prior to your se...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Setback savings - fact or fiction?

I'm not James but here's some thoughts... Have you tried to control for solar gain? And what about controlling for wind chill effects (speed an...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Replacing my 18 month old Hitachi Yutaki ASHP

Thanks, if the water can drain out of the heat pump without any issues in sub-zero temperatures then that's one possible issue ruled out. But if th...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Replacing my 18 month old Hitachi Yutaki ASHP

@trebor12345, a few questions if you don't mind... Does the water come from drain holes in the bottom of the heat pump or is there a pipe to carry ...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Replacing my 18 month old Hitachi Yutaki ASHP

It is usual for the flow temp to start to drop as a heat pump approaches a defrost, here's a 7kW Vaillant like yours doing the same (if less pronounce...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Replacing my 18 month old ASHP

@trebor12345 @jamespa If it helps any this documentsays the Hitachi RAS-3WHVRP1 can modulate down to 2.1kW at 7C OAT and 35C flow temp. So another ...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Page 6 / 11
Share:

Join Us!

Worth Watching

Latest Posts

Click to access the login or register cheese
x Powerful Protection for WordPress, from Shield Security PRO
This Site Is Protected By
Shield Security PRO →