How long to heat house.

[D_Hailsham]

A 30kW boiler seems on the large size for a three bed detached house. I live in a similar house, built mid 80's, and the heating side of my 37kW combi boiler is turned down to 12kW.

The required boiler output does depend on the total heating capacity of your radiators. There's no point trying to put 20kW from the boiler into 10kW of rads. The rad temperature will rise very quickly, as will the return temp, so the boiler will modulate down. If the boiler can modulate below 10kW that's fine; but if it can only modulate down to 12kW the boiler will go into on/off mode, which could explain why it is taking so long for your house to reach temperature.

How many radiators do you have? what type and what size?

The output of your boiler can be altered from the default 18kW (it's parameter d.0), with a minimum of 10kW and max of 30k.

 

[clayton]

I had some central heating guys look at the system and they gas rated the boiler and adjusted it to output to 20kw I believe, for some reason they wanted to change the 3 port valve but I didnt have that done.
The house has 13 rads all upstairs are new except one, The hall one I have also changed for a DPSC. The radiators in this house take over 90 minutes go get hot and maybe 3hrs for the boiler to my 69c setting.





The red arrows show the points and in between that show where the magnet finds the metal particles.

Hope these picture help

Thanks.

 

[HERTS P&D]

You need that section cut out and replace/clean and by the sounds of it you may need a new 3 port valve.

Andy

 

[HERTS P&D]

How much did they quote you?

Andy

 

[clayton]

How much did they quote you?

Andy

Service boiler and seal kit, re pipe H connection and replace 3 port valve £579 but the included fitting the rad in the hallway I've done myself.