Hi .. We are needing to update the heater on the bus from a Dickinson P12000 gas to an LPG or Diesel blower. . Not sure which is the better bet. The one we have is 4000 btu on low or 5000 on high .. and does not have the fan attached which causes it to be much less effective in heating the 7.7 m bus. Have read thru the forum of peoples experiences with Suburban and Proplex.. and there seems to have been a starting problem that was fixed in more recent models? . Can a diesel be operated while travelling? and are the blower heaters noisy from outside when operating with the thermostat? would a 2kw be sufficient ? or would the 2.4 be better? Thank you .
We have got a 1.9kW Propex LPG heater which works quite well, but there are three issues :-
(1) It is only just powerful enough for our 7 meter bus.
(2) It is quite noisy.
(3) In very cold weather, the LPG has trouble vaporising fast enough to adequately supply the heater. This, of course, is when you most need the heater!
Since we don't use it all that much we will not be replacing this heater, but with hindsight I wish I had installed a Diesel heater such as a Webasto or Eberspacher. With your 7.7 meter bus, I would go for the 4kW D4 model, rather than the smaller 2.2kW D2 model. Faster heatup. Equal low power fuel economy. Lower airflow for the same heat. (So, at the same heat output, the bigger model is actually quieter than the smaller model.)
Look carefully at the specifications of any heater you consider buying. The minimum airflow rate will give you some idea as to how quiet the unit can be. (D4 19cfm, D2 30cfm, Propex 60cfm) Get the comparative noise figures if you can. Diesel heaters usually range from 41dB to 48db. (Propex 65dB)
Then there are the Chinese copies which are considerably cheaper. I don't know how good they are.