Buy one that claims to be 8kw. They are only 4kw. The 5kw ones are actually 2 to 3kw. But not alwaysAgree with all of that and matches my thoughts from the use of the D1LC i have in the 110. The pump for that is mounted on the chassis and it ticks away - can be heard when stationary but not when driving. I might go for one as a cheap solution to the non - working gas/electric Truma heater in the caravan. Think that's only 2.5-3kW actually so a 5kW air heater would be an upgrade thinking about it. The rest of the space removing the Truma would leave can be converted to a cupboard!