Permanent connection to drain tap

[jayc89]

When I had our boiler moved a few months ago, the wally who did it decided to not re-fit the drain tap. Right now I can manage by draining from a downstairs radiator, but I'll soon replace that with UFH, so I need to install a drain tap somewhere. The best place would be in the understair cupboard, just before the UFH pump, but to actual drain I'd need to run a hose pipe through the house.

 

At the otherside of the understair cupboard wall will be the basin in our downstairs W/C. The waste pipe for that is to be boxed in, could I fit some sort of permanent pipe from the drain tape into my 40mm basin waste? Perhaps using 21.5mm condensate pipe or similar?

[TonyT]

I have at my furthest radiator  a T into the flow and return under the floor at  each of the pipes goes to a handle operated valve then they join together  with another T and 1 pipe goes outside.

 

it let’s me drain the system down without hoses etc in normal operation the valves are closed, on opened when I want to drain it down.

 

This is next to the hatch so it’s easy for me.

 

I copied it from a heating spec we were using at the time in 2004.

 

[jayc89]

Something like that would work, but I want to drain straight into a waste pipe, not run anything else externally.

Could I use a 22mm compression fitting to join the existing 22mm copper going to my UFH to a 21.5mm condensate pipe and then connect that to the 40mm waste?

[jayc89]

Trying to figure this out again as I'd like to get it sorted over the weekend ready to finish off this part of the house next week. I think I need something like this;

 

 

But I'm not sure how to connect the Lever Valve to the 40mm (solvent weld) waste. I can get a 40mm to 21.5mm reducer typically for condensate pipes etc, can I somehow join a length of 21.5mm solvent weld pipe to the other end of a 22mm lever valve?

 

Any ideas @Nickfromwales?

[Temp]

Might work but check pipe sizes as 40mm waste isn't 40mm in diameter...

 

https://www.amazon.co.uk/sourcing-map-Reducing-Coupling-Connector/dp/B07KZBDMFV/ref=asc_df_B07KZBDMFV/?tag=googshopuk-21&linkCode=df0&hvadid=372163213199&hvpos=&hvnetw=g&hvrand=8201592123698109016&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9046819&hvtargid=pla-825949270060&psc=1&tag=&ref=&adgrpid=83288553744&hvpone=&hvptwo=&hvadid=372163213199&hvpos=&hvnetw=g&hvrand=8201592123698109016&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9046819&hvtargid=pla-825949270060

 

Edit: actually that says 20mm pipe not 22mm so probably won't work.

Edited June 24, 2023 by Temp

[Nickfromwales]

On 23/06/2023 at 21:20, jayc89 said:

Trying to figure this out again as I'd like to get it sorted over the weekend ready to finish off this part of the house next week. I think I need something like this;

 

 

But I'm not sure how to connect the Lever Valve to the 40mm (solvent weld) waste. I can get a 40mm to 21.5mm reducer typically for condensate pipes etc, can I somehow join a length of 21.5mm solvent weld pipe to the other end of a 22mm lever valve?

 

Any ideas @Nickfromwales?

For a drain point you can accept a compromise here. 21.5mm o/f pipe will actually seat quite nicely into a 22mm push fit connector. So 22mm pipe into one side, and 21.5mm into the other will work. 
Tbh, you could even use a 22mm compression coupler, with a 3/4” olive in the 21.5mm side. None of this would be anywhere near the chat if this was either a potable or a heating circuit, but it’s to save you using a hosepipe so we can allow a pinch of “it’ll be fine”.   

Go with a push fit coupler is my advice, but when draining just go easy vs tap wide open at max wallop.

For belt and braces you should go into a 22mm x 22mm tundish, and then into a suitable waterless trap (eg so you can see when it’s finished draining off). 
 

[Nickfromwales]

Happy days. Just read it back and it’ll take 22mm pipework.

 

Thank me with beer. 👍

[jayc89]

9 hours ago, Nickfromwales said:

Happy days. Just read it back and it’ll take 22mm pipework.

 

Thank me with beer. 👍

Brilliant, thanks. These beers are adding up!

[Nickfromwales]

1 minute ago, jayc89 said:

Brilliant, thanks. These beers are adding up!

I can arrange transport at a moments notice.  My mate has a class 1 hire company. 18 wheels a-rolling