Is weather compensation worth it?

[jayc89]

I'm considering buying a weather compensation kit for my system boiler. 

 

It's configurable and allows you to choose the curve required for your system. There are a couple of options;

 

Curve 30

Outside Temp: 20c. Flow Temp: 47c

Outside Temp: 0c. Flow Temp: 73c

 

Curve 20

Outside Temp: 20c. Flow Temp: 20c

Outside Temp: 0c. Flow Temp: 52c

 

Curve 30 seems useful for the colder periods, especially for the upstairs rads until I fit IWI, but given I also use the boiler to heat our unvented cylinder, neither seem appropriate in the summer months.

 

Ultimately, I hope to heat the hot water using PV in the summer months, so the boiler would be off altogether. In which case, is weather compensation actually that useful?

[JohnMo]

You really need the heating and boiler capable of giving different temperatures for DHW heating and central heating, otherwise it's pretty much a waste of time.

 

If you set it up well it may be worth while.  For WC to work properly you run the heating 24/7 with a setback of a couple degrees overnight.  So ideally you heat DHW at night when the boiler isn't doing much work.