Waterless Traps and Washing Machines

[start never finish]

Hello gurus!

hoping you can help me with a query.

I’m replacing my washing machine and want to take the opportunity to tidy up the plumbing to give me a little more space.

the old machine waste pipe sits in a standpipe around 700mm high, then down into a p trap which goes to the waste coming from the wall just above floor level.

I am planning to use an osma hepvo waterless trap to save the space of the p trap.

if I do this, do I still need to connect the hepvo trap to the standpipe and sit the WM waste in the top of that, or can I (with appropriate fitting) connect the WM waste directly into the hepvo closer to ground level?

thanks v much !

 

[denso13]

You'll still need a standpipe for the hose. There should be guidance, height etc., in the WM instructions.

 

[Madrab]

I wouldn't use a waterless trap. Washing machines and dishwashers are notoriously bad for leaving deposits behind, check out your spigot and waste and you'll see what I mean.
The diaphragm inside a waterless trap can become easily clogged and then doesn't close properly and it then starts to smell and needs cleaned regularly.