if you had a lot of commercial where you run the water without shutting off i think they would be good to use, however with domestic i'm forever turning my aquadapter on and off, this is not good for the diesel heaters as the burner will eventually coke up and cost more than a gas heater to replace,
only advantage i see of diesel over gas is drawing the diesel from the vehicles fuel tank so you in theory wont ever run out when on a job
the gas heater is lighter (the pure freedom heater weighs 45kg),
gas is cheaper to run
gas is cheaper to buy 200 quid vs £3000
batterys cost 4 quid for gas you need leisure batterys for the diesel
Dazmond i know you arnt very open minded and you always think the way you do things is the best and only way it should be done, you once thought trad is better than wfp and a trolley is better than van mount etc etc
eventually you will post up saying hot is better than cold, it is, first cleans conny roofs even maintainence cleans the lot