Hi all - sorry if this has been asked before, but has anyone retrofitted the new style gas/electric Truma water heater to replace a gas only unit in a 2005 build van?. I have hookup when I use the van for work and its FREE!!!, so i use the freshlight to heat the van and it would be handy to have electric water as well in those circumstance but retain the gas facilities for the odd occaision that the hookup is not available.