On a different topic; does anyone have an instantaneous hot water unit in their van. 2021 Journey have this type of HWU. I had a storage tank on my Expanda which was about 20 litres which I was happy with. Not really convinced yet with my instantaneous unit on my new van. You have to wait a little for the hot water to arrive and it only arrives if you have certain pressure. If you just want to trickle the water out the HWU does not fire up to heat the water. The benefit of having never ending continuous hot water is probably not really a benefit in a caravan, especially off grid. I would have liked to have been given the option...
I installed a Camec heater in my older van around 18 months ago. I installed an instantaneous heater because as a plumber gasfitter I love the concept of instantaneous heaters based on experience of Rinnai type domestic heaters.
New to the market I chose the Dometic heater somewhat on price and function being similar to the Smartec heater that I had been relying on. Any way the first heater was was problematic and being a gas fitter, in consultation with Camec I did a lot of fault finding for them. In the end they sent me a new heater and that one has been a little more successful but still not great.
The problem all relates to the flow control valve that triggers the burner, not enough flow and the heater won’t light, to much flow and the heater will light but the flow is to quick to heat the water. It works better on pump pressure and with the sink aerator removed but you can dump a lot of water before getting to a useable temperature.
Interestingly, I installed Truma instantaneous heaters in 3 new van builds of mates and are aware that have been working fantastically with one van being permanently on the road and in use. Although they are double the price I think the Truma is the better option.