Combi dilemma!

[marshian]

35 minutes ago, SteamyTea said:

What base temperature did you use for your HDDs?

16.5 is my base - slightly higher than the normal 15.5 but the HDD site has a regression tool that I used to establish it after the last round of improvements and I’m pretty happy with the base line

 

You have to bear in mind it’s a stupid shape house with a lot of rooms having 3 external walls which means it’s not a std box with two levels

[SteamyTea]

22 minutes ago, marshian said:

regression tool

When I get some time, I shall see what I can match to my data.

 

23 minutes ago, marshian said:

a stupid shape house

Most houses are,  They should really be domes.

Stick them on a turntable and they can track the sun, or untrack the sun, depending on seasons.

[marshian]

37 minutes ago, SteamyTea said:

When I get some time, I shall see what I can match to my data.

 

Regression tool is on this site - dead easy to use if you have data in xls or similar table format

 

https://www.degreedays.net

 

Only caveat is do your best to exclude HW energy usage or you'll get a funny answer (ie a lot more than your true baseline temp)

 

37 minutes ago, SteamyTea said:

Most houses are,  They should really be domes.

Stick them on a turntable and they can track the sun, or untrack the sun, depending on seasons.

 

Eskimos had the right idea then

[DamonHD]

With the final fiddling of the bypass valve setting, I think that the heat pump system can be regarded as 'working' and forgettable:

 

https://www.earth.org.uk/heat-pump-16WW-control.html#2025-02-10

 

So, just the time to rip apart the DHW side to start to put back the heat battery!

 

https://www.earth.org.uk/reconnecting-the-16WW-heat-battery.html