Our van is 23'6" inside I reckon ours might be working a bit harder than your van , never the less I reckon I might speak to Dometic about it , if it lasted a week I'd still be happy .
We had a problem with a new diesel heater using about 5 litres a night. Turned out it was a loose joint on diesel connection and was leaking under van. Have a 22 van, fixed problem, now use about 1 litre a night.
Lynda
-- Edited by Felicia on Wednesday 3rd of August 2016 07:07:03 PM