I have just bought my husband a Karcher K4 complete control pressure washer to replace his 20 year old defunct one which gave up the ghost. . It was supposed to be for Christmas but it arrived and he saw it!
I got the K4 because I thought it was the better one - reading reviews. Now OH tells me it cannot be used on a mains supply because it is too powerful. Is this true?
I didnt get it to use on a ruddy water butt. I intended it to link into the outside tap where we currently have the hosepipes connected.
Why do none of the review sites or even the information about the K$ state it cannot be used on domestic supplies? OH read it in the instructions ( yes it does say " cannot be used on the water net") . So, can it be used or not?
What it actually says is "the appliance must never be used on the
drinking water net without a system separator."
Which sounds like Karcher-speak for "should have a double check valve on
your garden tap" but you should have one anyway.
On Sun, 12 Nov 2017 23:55:06 -0800 (PST), sweetheart
But after" cannot be used on the water net" it goes onto say "without
a system separator". EN 12729 Type BA .
Water net I would hazard a guess means the mains water supply in a not
too perfect translation from German . The costly EN 12729 Type BA
devices that can be purchased to enable legal connection may be a
German regulation. Here I would just make sure the tap you intend
connecting it to is a reasonably modern one that has a double check
valve arrangement built into it or fit one in the supply pipe.
That is what the 1000's of other people who buy pressure washers in
the UK will be doing.
If you are still worried that may break regulations arrange for it to
draw water from a butt but have a hose filling it about the same speed
as you are drawing water from it, could even use a large flow ball
valve arrangemet in the butt to do that automatically on the feed.
Water Butt about £35 . Float valve around a tenner , tenner for
sundries, total about £55 .
Backflow preventer as suggested by Karcher manual , Around £450.
Don't think many people wll be going that route.
OTOH is your other half concerned that you actually have too low a
water pressure to supply the machine anyway?
If so just use the water butt method and accept that periods of rest
may need to occur while it fills up again.
Thanks to everyone for the replies. I have informed my husband it probably means a non return valve ( which we already have). He nodded. I suspect he was just trying to upset me because I bought the pressure washer for him without asking him first.
That Santa is a complete bastard delivering the present in November.
Why don't you nip off down to a Ann Summers store and buy some sexy
underwear and give your husband a proper Christmas present to unwrap?
Not because it is too powerful but because the water companies don't
like you connecting things that can potentially pump chemicals back into
their drinking water supply network if things go wrong.
I think you will find it actually means that you should have a
non-return valve in the path to the tap (and that will have been true of
your previous one too). It is to protect the mains water supply from
blowback of industrial detergent into the supply.
(Amazon.com product link shortened)
There are cheaper ones - this was the first I found online.
Mine is a Hozelock.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.