Heating for new extension

[adam999]

Hello


Our current house is a 4 bed detached with radiator heating and a combi bolier - a Worcester Greenstar Highflow 440 fitted in 2007. Boiler is working fine.


We are in the middle of having a significant extension on the ground floor - 70 to 80 sq m of new space. Extension will have underfloor heating. We are also having underfloor fitted in the existing kitchen.


Plumber has proposed moving to a unvented pressurised cylinder system as we have a number of bathrooms. This also means a new boiler and a Worcester Greenstar 24ri has been proposed.


I'd be really grateful for some advice:


1) My research suggests the new boiler has a lower output than the old one - is this sensible?


2) Quote received is for supply and fit boiler, supply and fit 300 litre unvented pressurised cylinder, connect up under floor system and join to existing heating and hot water system. Supply and fit new 22mm water main pipework to boiler from stop tap. £3,850. Is this in the right ball park? We live in Rugby.


3) Would the existing boiler have any resale value i.e. e-bay?


Thanks


Adam

 

[tamz]

You (or your plumber) needs to size the boiler to suit the load. Presumably he has done this.
The highflow wasn't sized on the heating load, more for the hw demand.
Your not getting robbed. I'd be more expensive.
As for ebay, there is always some numpty out there looking for a bargain. Who knows. Its worth about a fiver in scrap.

 

[Riley]

Maybe get another plumber to quote you an unvented cylinder is definitely the best option as long as you're set up can cope with it.
I am not familiar with your current boiler but could this not be repiped accordingly to run the unvented cylinder ?
Speaking honestly I think anybody that buys secondhand gas appliances is a mug and is just asking for trouble it will have next to no scrap value

 

[Gasmk1]

Yes the unvented cylinder is better for you and that price is a good one when going from a combi to a regular boiler the combi is sized for instantaneous hot water so that's why it is 30 kW. Or more it will be less for the heating side. Check on the Worcester site it gives some basic advice on which boiler to get. Personally I would go with a different make.