flexi compression fittings on c/h system

[neiloneil]

Just wondered if I should use the flexi type of fitting under the floor on heating pipes. do they stand up to the heat and pressure over time?

I know people use the pex pipes, but i don't trust them from what I've heard from people that have had failures. My thinking is that a soldered joint or compression will leak within a few days if its going to, but the speed-fit can just fail for no apparent reason.

I have actually done the job with all soldered joints, so academic really, just wondered if I could have cut corners a bit with the tight bends and cross overs etc

 

[mogget]

Well it's best not to cut corners, but Smith's plinth heaters and hydronic fires come with compression flexi's and they seem to last long enough. I wouldn't want them on view though. And you can't just use any flexi it has to be designed for heating.

 

[JBPHS]

Kickspace heaters usually installed with flexis. They do block up with magnetite very easily though. For this reason, I always fit a valve above the flexi, so that it can be removed without draining the whole system to clean or replace the flexis.

James.

 

[neiloneil]

2 good points i had not considered, but means its possible though . I make sure its rated for heating systems, and fit a valve either side (if used for both flow and return).

Could have saved myself a bit of time there if I'd known.

Thanks for your advice.

 

[neiloneil]

15 bar max working pressure, 70°C max temp.

Would this be ok?

 

[mogget]

Heating systems run anywhere up to 82degC