01995 640079 mail@kphltd.co.uk

Just a quick reminder that we have been lucky so far, but Jack Frost could be just around the corner waiting to damage your expensive horsebox water system!

Hopefully we won’t have any, but with the onset of frost one of our more common seasonal repairs is replacing damage to horsebox water systems. This can be extremely expensive and is really simple to avoid if you get into a routine of draining down.

The cause of frost damage

Damage is caused by the freezing process as you may expect. As water freezes it expands, if this happens inside your water system it will crack joints, pipes, seals and even the body of the water heater itself.


It’s as good a time as any to pre-empt any frost damage and offer some general advice on draining down your horsebox water system. To avoid frost damage the water system should be drained down as completely as possible. To do this, first turn off the water pump and then open all the taps fully. Next, open the drain down tap on the water tank and lastly the water heater bung or tap. This should allow any water to drain away.
It’s always a good idea to run the water pump again for a few seconds to purge any water left in the pump. Water heaters are all different, but all should have a bung or tap to allow drain down.

Refilling the water system

This should be basically the reverse of draining down with one important hot water tap addition to protect the water heater from damage.
Close the water heater bung or tap and close the water tank drain down tap. Fill the water tank and turn on the water pump. When water comes out of the cold taps smoothly (without any air or spitting) close these. This just leaves the hot taps and hot water system to purge of air. It is imperative that water comes out of the hot taps smoothly (without any air or spitting) before turning off the hot taps.
That’s the full process and really quite quick when you get into a routine, I hope it helps.