Join Date: May 2005
Thanked 19 Times in 13 Posts
Lunar Drain tap
Just spoken to a friend with an H620, the drain is in the bottom of the freshwater tank, it has a tee handle on a bung which you pull out.
Our H621 is a separate lever near the exhaust pipe on the offside behind the skirt, pull the handle down 90 degrees to dump water, push up to close it.
Don't do it in your best trousers!.
If all else fails you should be able to operate the heater low temperature dump on the side of the boiler, Hope this helps