trident hitop 2003/4 carver P4 unit

for giving blown hot air only,not hot water. doesnt seem to work so is it possible to put an upgrade in to my van? hoping for some sort of unit that will work with electric/gas or ideally off of diesel engine and electricity. something that would work well? is this possible? I am a novice at all this and totally confused- any help appreciated. many thanks

The P4 is only a hot air blower totally separate from water heater and you could replace with a Propex heatsource system. Google Propex for details.
You can get the P4 reconditioned, someone regularly advertises the service on eBay.

It seems that hot water was an optional fitting on the T4-based Tridents, using the venerable Carver Cascade - but that may have been obsolete by 2004. There are more recent alternatives, but of course you would have to cut a hole in the side of the van and upgrade all of the pipework.

Diesel heaters are also available (Webasto, Eberspacher, MV Aero), but they are shockingly expensive, and you are unlikely to get one installed for much less than £1.5k - hot water is possible from some (e.g. Eber Hydronic) but that's going to be even more costly and more difficult to install.