Renewable Heating Hub Heat Pump Forums

Search with Wattson
Forums
Renewable Heating
Air Source Heat Pum...
Mitsubishi Ecodan 1...
 
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!

Mitsubishi Ecodan 14kW ASHP costing £450-£550 per month to run

 
Page 1 / 4
Air Source Heat Pumps (ASHPs)
Last Post by Derek M 4 years ago
39 Posts
9 Users
38 Reactions
13.7 K Views
RSS
 marknhudson
(@marknhudson)
Active Member Member
Joined: 4 years ago
Posts: 15
Topic starter 28/12/2021 11:19 am   [#247]

I'm new to this forum (and any online forum for that matter). I'm at my wits end with an ASHP that's costing over £450 pcm in a new build home (Oct & Nov). December is on course for £550 for the month according to the smart meter. Despite assurances from Mitsubishi and independent experts that I'm set up correctly I can't believe that's true. 

I have a Mitsubishi Ecodan 14kw ASHP

Underfloor heating downstairs

Rads on 2nd and 3rd floor in a 5 bed house approx 3000 square foot home.

House build in late 2018.

Please could you point me in the right direction for some advice?

Thank you



   
Quote
 prjohn
(@prjohn)
Estimable Member Member
Joined: 5 years ago
Posts: 125
28/12/2021 12:39 pm  

Hi, Welcome to the forum.  Just a couple of questions to get started.

Was the HP installed when the house was built or was it an add-on after the house was built?

What is the energy requirement as per EPC?

Do you know your heat loss calculation?

What temperature are you heating the house to?

Are the temperatures of the top floor radiators hot?

 

 



   
ReplyQuote
 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
28/12/2021 12:57 pm  
Posted by: @marknhudson

I'm new to this forum (and any online forum for that matter). I'm at my wits end with an ASHP that's costing over £450 pcm in a new build home (Oct & Nov). December is on course for £550 for the month according to the smart meter. Despite assurances from Mitsubishi and independent experts that I'm set up correctly I can't believe that's true. 

I have a Mitsubishi Ecodan 14kw ASHP

Underfloor heating downstairs

Rads on 2nd and 3rd floor in a 5 bed house approx 3000 square foot home.

House build in late 2018.

Please could you point me in the right direction for some advice?

Thank you

Hi Mark,

Do you know how your system is being controlled? Do you have thermostats and TRV's? Is the FTC controller set for weather compensation control? If you are not certain then post a photo of the controller screen.



   
ReplyQuote
 marknhudson
(@marknhudson)
Active Member Member
Joined: 4 years ago
Posts: 15
Topic starter 28/12/2021 1:32 pm  

@derek-m Thanks for coming back so swiftly. 

Do these pictures help? We have 6 underfloor heating zone controls on the ground floor as pictured and then a control on the first floor for the rads plus the main control hub in a closet as pictured. 



   
ReplyQuote
 marknhudson
(@marknhudson)
Active Member Member
Joined: 4 years ago
Posts: 15
Topic starter 28/12/2021 1:36 pm  
IMG 3155


   
ReplyQuote
 marknhudson
(@marknhudson)
Active Member Member
Joined: 4 years ago
Posts: 15
Topic starter 28/12/2021 1:36 pm  
IMG 3156


   
ReplyQuote
 marknhudson
(@marknhudson)
Active Member Member
Joined: 4 years ago
Posts: 15
Topic starter 28/12/2021 1:36 pm  
IMG 3157


   
ReplyQuote
 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
28/12/2021 1:56 pm  

Hi @marknhudson 

Please press the F1 button and let me know what the displayed temperatures are reading.



   
ReplyQuote
 marknhudson
(@marknhudson)
Active Member Member
Joined: 4 years ago
Posts: 15
Topic starter 28/12/2021 2:14 pm  

@derek-m Hi Derek, I've pressed the first of 4 buttons but the display doesn't change much. Just showing this...

IMG 3158

 



   
ReplyQuote
 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
28/12/2021 2:32 pm  

Hi @marknhudson 

Do you know how to check and/or adjust the weather compensation parameters?

Do the radiators get warm to the touch?



   
ReplyQuote
 marknhudson
(@marknhudson)
Active Member Member
Joined: 4 years ago
Posts: 15
Topic starter 28/12/2021 2:44 pm  

@derek-m Not sure but I can have a play around with it. Is there some setting that it should be set to?

 

Rads get warm but never hot



   
ReplyQuote
 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
28/12/2021 4:42 pm  

Hi @marknhudson

Warm is okay, cool is much better for improved efficiency.

It would appear that the 'Information' screen is not available if you have 2 zones set.

Press and hold the 'Menu' key for 5 seconds and then select Heating/Cooling. Press 'F4' key and select 'Zone 1', then press 'F2' or 'F3' to view the actual parameter settings. Since I don't know the heat loss for your home you could try adjusting to the following:-

Set the water flow temperature to 45C at an outside air temperature of -10C, and a water flow temperature of 25C at an outside air temperature of 18C. Confirm the settings, then check the values for Zone 2 and adjust if necessary.



   
👍
2
ReplyQuote
Page 1 / 4
Forum Jump:
  Previous Topic
Next Topic  
Share:

SPONSORS

Join Us!

Installer Finder

Degrees of Separation

Latest Posts

SPONSORS

Click to access the login or register cheese
Protected By
Shield Security PRO