Momac

So is this a fault of HVO caused by cold weather? Or is it ''bug'' ?

We have had relatively mild winters for so many years its easy to forget that frost damage is a possibility. I can recall 4 inches of ice on the marina water and the boat locked solidly in position. I think that must have been around 2012 but could have been earlier . We we lucky and the only loss to the frost was a shower head. I had a macerator pump broken in the winter of 2020/21 that was most likely frost damage. It's been another mild autumn this year with relatively mild temperatures forecast next week but there is no certainty that damaging frosts will be absent over the next few months.

I use a dehumidifier also . The dehumidifier is on the boat but I haven't felt a need to switch it on yet . The bohat felt dry enough at the weekend.

I always drain the domestic fresh water as this is where the greatest risk of frost damage occurs. Running the pump should not cause it any ham The calorified will remain full if not drained . I use a frost protection heaters on thermostats as I have shore power.