Problems Draining Hot Water Tank
I know there are various arguments running as to if this is necessary when moving on, however, we almost always do.
This tour it has refused to drain each and every time. I have opened drain valve and taps, but it refuses to drain. The drain valves seems to open as there is an initial few drips before it dries up. On bumping out of the campsite it starts draining and from the amount required to prime it, at the next site, it seems to all come out. Our system is an Alde.
My question is do you think it is just the valve sticking, or not opening properly, or is there some other vent that is not performing.
It is not a significant problem at the moment, however come the winter I want to be sure it has fully drained down, and this is difficult when you can't monitor it,
Comments
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SteveL, I mean absolutely nothing Personal with the Following, { Honest
}Open the drain valve first then just ONE tap set to Hot obviously ( I'd use the shower head if its small enough ) then BLOW like blazes back down the tap. If its just a tad sticky it might well get blown open before you need to do anything else
or even 
!!B
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Steve, not an Alde user but the hot water drain valve on the Truma always activates the water pump (provided its tirned on at the control panel) and the water is literally pumped out of the system.
OK, a bit different on a MH in that, if the fresh water tank has not been drained (via a separate dump plug) first, all the remaining fresh water will be drawn into the boiler and then pumped out via the tiny drain valve, not really what you want as it will take a looooooong time - just draining 10 ltr from the hot tank via the small valve is not a quick task.
we also have a second set of valves at the 'lowest point' of the van to ensure that, after emptying the fresh tank then the hot tank, no residual water is in the pipes.
try turning on the water pump or is this not possible with the wastemaster empty/disconnected? is your pump a submersible in the wastemaster?
so what is is that maintains pressure and forces the hot out of the taps? is it the pump in the wastemaster? if so, how is the hot tank supposed to be evacuated (in a sensible time) if there is nothing 'pushing' it out?
bearing in mind how slowly ours drains, even with a pump on, i just feel that gravity alone needs a bit of help, but of course, our pump is inline in the pipework and fresh water gets 'sucked' into the system rather than yours where the water in the wastemaster 'pushes' the hot out via an external submersible pump.
our pump will 'do the job' (by pumping air through the hot tank) even with no water in the fresh tank, whereas this cant happen with an external pump with no water to push....
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we had a similar problem a good ten years or so now. From what I member the local dealer/service person seems to know exactly what part had gone wrong and fixed it in minutes, something to do a non return vale near or on, the actual hot tank. When you open the drain, the pressure drops in the pipes and allows this non return value to open and the water comes out of the tank.
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please excuse my repeated typo of 'wastemaster' when i obviously meant 'aquaroll'....
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Thanks all. I will try blowing ABM it's worth a try.
BB On our Unicorn it is an internal pump, which is safe to run dry, so I did try that, unfortunately to no avail.
Yes ET that is exactly what we do.
CS I am taking it in and leaving it with them to sort out the Satellite dome in a few weeks, so if ABM's fix does not work I will ask them, hopefully they will be as wise.
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