WB Boiler 1.A lower setting query/ post adding insulation

[finlaand]

Hi all

2008 Worcester Bosch 40cdi regular fitted. House was solid walls no insulation.

2026 Insulation at 43% (50mm celotex) added by me to rooms. Will also rise as /when I do 1 or 2 rooms each year refurbished.

I had that fun thing Google Gemini suggest I go to Service Menu, and change heating now to 60/100 instead of 100/100 as over powered for new state of house today.

Just done the change to 70/100 so will see affect and whether Wiser Hub (on eco/ smart with wiser trv's) notices and i see longer times to heat or x.

What confuses me is why noone ever told me this was an option (to change power for heating and leave 1.B hot water at 100%) as must be literally millions of houses out there with oversized systems as people all adding insulation.

 

[finlaand]

Guess not a popular topic, anyway two days in to setting change and all fine in my house not noticed anything, which tells me boiler was happy at 28kwh running our heating.

I'll wait a few weeks and if all good, set it to 60/100 as test 2.

 

[denso13]

which tells me boiler was happy at 28kwh running our heating

You only need about 1kw per rad, maybe less. How many have you got?

 

[Johntheo5]

Guess not a popular topic, anyway two days in to setting change and all fine in my house not noticed anything, which tells me boiler was happy at 28kwh running our heating.

I'll wait a few weeks and if all good, set it to 60/100 as test 2.

You may now get a lot of boiler cycling as its minimum output is ~ 8.5kW.

 

[finlaand]

Presumably the exact opposite, as not firing at full blast to then hit it's target temp so quickly when wiser actually only wants 2 of say 17 rads heat.

Anyway I'll update as said in a week or two. But why noone giving this advice hmm, if a 45 second hit on a few buttons can reduce kWh usage by 3% annually, you would have a million plus signing up to that youtube video.