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Mitsubishi ecodan settings

 
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Air Source Heat Pumps (ASHPs)
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JamesPa
 JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 4830
09/05/2026 3:35 pm  

Posted by: @batpred
↑

For heating, I believe all we will need is to have it working as a programmable thermostat with different temperatures for different times of day and also vary by weekday (not necessarily for 7 days, but to have some flexibility). 

I am not a Mitsubishi owner so can't speak with authority.  The question you should ask yourself is do you want to vary flow temperature with time of day (and oat of course) or use a thermostat as an on off switch to do setback/set forward, with ft depending on oat only.  Most heat pumps will do the latter, relatively few do the former.  I can't comment on what Mitsubishi r290 pumps do.


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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Batpred
 Batpred
(@batpred)
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Joined: 1 year ago
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09/05/2026 3:46 pm  

Posted by: @jamespa
↑

I am not a Mitsubishi owner so can't speak with authority.  The question you should ask yourself is do you want to vary flow temperature with time of day (and oat of course) or use a thermostat as an on off switch to do setback/set forward, with ft depending on oat only.  Most heat pumps will do the latter, relatively few do the former.  I can't comment on what Mitsubishi r290 pumps do.

Ah, I should have been clear, I do not mean flow temp but the target room temperature. I only anticipate having a lower target at night as we find it better for sleeping. 

 


8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kw export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; 100Amp head, HA lab on mini PC


   
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JamesPa
 JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 4830
09/05/2026 4:03 pm  

Posted by: @batpred
↑

Ah, I should have been clear, I do not mean flow temp but the target room temperature. I only anticipate having a lower target at night as we find it better for sleeping. 

 

Yes but there are two ways to do that, the first is to turn the heating pump off altogether using a thermostat (because that is what will happen), then turn it on again when the room has cooled.  This results in room temperature control by thermostat.  The second way is to reduce the flow temperature.  This results in heat pump control by flow temperature.  

They have different characteristics.

Another, arguably better, way to achieve what you want is simply to reduce the room temperature of the room where you sleep permanently, which is how the mcs design rules work.  Obviously this assumes you use predominantly different rooms for sleeping and living.

How quickly does your house cool.  Reducing target temp doesn't reduce house temp.  Loss from the house does that.  This may be too slow to achieve what you want in which case differential room temperatures is the way to go.


This post was modified 42 minutes ago by JamesPa
This post was modified 40 minutes ago by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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Batpred
 Batpred
(@batpred)
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Joined: 1 year ago
Posts: 833
09/05/2026 4:47 pm  

Posted by: @jamespa
↑

Obviously this assumes you use predominantly different rooms for sleeping and living.

Typically yes, if we exclude nodding off watching US "news" 😀 

 


8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kw export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; 100Amp head, HA lab on mini PC


   
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