Installing two radiators

[Chrisl69]

I have two radiators that I need to install in slightly different locations to the originals. The cheapest quote I have had is £1,150 with me supplying the rads myself, which is unaffordable so I want to explore doing the job myself.

The flow and return are in concrete screed. I have excavated the screed and can access the pipes easily. There is enough space to cut and clean the pipes and fit equal tees or equal 90s as needed. One appears to be the end of the run so will need equal 90s and the other will just need to be extended to its new location.

Being below the drain off location, it will be harder to drain the flow and return completely.

I am happy to pick up a blow torch and some Yorkshire fittings - vicariously self taught watching videos - and give it a go. I will lag everything before replacing the screed. Alternatively though, as the pipes are more adjacent to the screed than within it, and right at the edge of the room, can I use the non-demountable Tectite fittings? The product sheets say they can’t be buried in screed directly, but they can if protected with space for expansion.

 

[Madrab]

You don't want any type of non soldered fitting encased in screed IMO. Soldered copper is considered part of the pipe once the joint is made, hence really the only acceptable way to have a join within the screed.

Draining a system to allow soldering can always be an issue if drain off points aren't included at the lowest point of the system, it really is CH design 1 'o' 1 but regularly left off when a system is installed. Can supplementary drain off's be added? If the pipework can't be drained then soldering will be very hard to do properly. Alternative may be just cut at the point needed and let the system drain and then dry it out with some heat.