Dishwasher waste/water tubing routing...

richieboy · 2 Jun 2017 at 08:10

So, i am very excited as today our new dishwasher arrives, have been here 10 years using the good old fashioned sink'n'brush and my scarred hands cant takes no more!

I would like to ask you gentle folk what you think regarding the routing of my dishwashers waste and water tubes - we have a water tap under the sink and a waste there also, and routing should be straight forward but i have two options and can't decide on which - high, or low? Am aware that i should have a "high loop" under the sink so have factored that in to my highly skilled technical drawings below, so..which option would you choose?

mattyg · 2 Jun 2017 at 08:16

Low

Not even sure high would work.

The pipe from your dishwasher will most likely be high. That pipe needs to exit into waste at a lower level or waste water may flow back to the dishwasher.

Your cold feed wont make a difference thats under pressure so whatever is easier

Ideally you want the waste to have a little fall on the pipe

If you picture water in your red pipe what is there to push the water out.

richieboy · 2 Jun 2017 at 08:24

Thanks matty, dishwasher arrives later today so not sure where the waste comes out yet - I did have a Google and would appear to come out at the bottom - not sure how I would get a fall on that! Plus everything i have read says you need a high loop before the sink waste so I was assuming the waste water is pumped out of the dishwasher rather than just having to use mavity?

mattyg · 2 Jun 2017 at 08:38

richieboy said:
Thanks matty, dishwasher arrives later today so not sure where the waste comes out yet - I did have a Google and would appear to come out at the bottom - not sure how I would get a fall on that! Plus everything i have read says you need a high loop before the sink waste so I was assuming the waste water is pumped out of the dishwasher rather than just having to use mavity?

Its pumped to a point. But once its emptied the dishwasher you really also want the waste pipe to also be empty (as much as it can)

You can buy waste standpipes

http://www.screwfix.com/p/mcalpine-...gclsrc=aw.ds&dclid=CMSpvPbSntQCFYYx0wodZ6sBtA

You need a high point but you'll need to make sure the exit is lower than the high point

You'll get a horseshoe shaped pipe clip that'll help

richieboy · 2 Jun 2017 at 09:38

OK, so I'll start at the highest point dishwasher side and do a slight fall down to the waste exit..I guess essentially think option 2 above but the waste will slope downward toward the sink waste...

mattyg · 2 Jun 2017 at 10:04

richieboy said:
OK, so I'll start at the highest point dishwasher side and do a slight fall down to the waste exit..I guess essentially think option 2 above but the waste will slope downward toward the sink waste...

That'll do it