Change rad on unvented system

[Best]

As above replies say, you do not seem too confident and also definitely do not use isolating valves to connect on to the original pipes! What good would they be and also they could give trouble.
Just take pressure off system and connect one pipe at a time, using push fit connectors or elbows (whatever is correct) and make sure if you have to cut pipes that you use cutters and also use pipe inserts for that brand of pipe.

 

[king of pipes]

Save yourself a load of grief mate get a plumber in will be done in half the time cheers kop.

 

[jonna]

Thanks for the advice. The reason I was planning on putting ISO valves in place is that it would allow me to leave the radiator off the wall so I can make good the reboarding etc, then connect the rad (to exposed 15mm pipe) at a later date. I take the point regarding potential for issues in future though so will avoid if I can.

As for the previous q's, I'm aware of where the refill loop is (thumb valve on flex hose attached to exp vessel).

I'll deffo consider getting a plumber in though. What's a typical cost out of interest?

 

[Best]

A two hour job probably as you have pipes exposed already.

 

[jonna]

As above replies say, you do not seem too confident and also definitely do not use isolating valves to connect on to the original pipes! What good would they be and also they could give trouble.
Just take pressure off system and connect one pipe at a time, using push fit connectors or elbows (whatever is correct) and make sure if you have to cut pipes that you use cutters and also use pipe inserts for that brand of pipe.

What's the best way to connect 10mm hep2o to 15mm copper? From what I've seen, I'm looking at using a 10mm pipe into 10mm/15mm reducer, into 15mm straight coupling attached to copper. Was hoping there was a 15mm to 10mm fitting but hep don't appear to do it (and I'd rather stick with hep fittings on hep pipe - but aware mix/match is possible so long as inserts match the pipe)...

 

[moonlight]

Is yours like this

As you can see 15mm compression to valve, you could take off the valve and push gently the excess micro bore back into the wall. Rotate the elbow as necessary and fit straight TRV, new towel rail. Sorted. Re-pressurise and test

 

[jonna]

Is yours like this
View attachment 29844
As you can see 15mm compression to valve, you could take off the valve and push gently the excess micro bore back into the wall. Rotate the elbow as necessary and fit straight TRV, new towel rail. Sorted. Re-pressurise and test

I've got exactly the same setup actually - same TRV as well. Thanks for the suggestion, will definitely consider that as it avoids concealing a fitting in the wall. Thanks.