Boiler Condensate Pipe Reducer into 40mm

[Kirbs]

Is there any reason why the condensate pipe from the boiler can't be connected horizontally into the start of the 40mm waste pipe run which runs under the kitchen sink, using one of these: https://mcalpineplumbing.com/plastic-chrome-fittings/multifit-waste-fittings/r17-reducer-abs (providing the correct guidelines are followed regarding the rate of drop) or must it connect into the waste pipe from above using something like this: https://mcalpineplumbing.com/traps/condensate-traps-and-fittings/v1mx-co-universal-slip-tee ?


Thanks!

 

[oldbuffer]

1. You could use either.
2. The reducer is probably the easiest provided you are happy to solvent weld.
3. If you use the tee, you would need a stop for the unused side of the tee, but could do it all without solvent welding.
4. Not sure if there is a McAlpine compression equivalent of the reducer.

 

[Kirbs]

Thanks - I'm going to go with the reducer. The existing setup goes into one of those clamps onto the waste pipe that appear to be the norm, but looks like the installers didn't properly plan the pipe run and so the condensate pipe is practically dead horizontal. It would appear the most straightforward way of dropping a bit of height (i.e. without redoing all the pipework back to the boiler) is to ditch the clamp and go directly into the end of the waste. I'm happy to solvent weld.

 

[Madrab]

Check the boiler's MI. Some manufacturers require an airgap on the condensate run, primarily because the PRV is also plumbed into the condensate pipe and that needs to be visible if running. You also don't want the condensate to back up into the boiler if the waste pipe become blocked, so an airbreak or NRV would be advisable and then you may want to incorporate a trap.

 

[ianmcd]

As @Madrab says you will need to install an air break