Gooner,
The Alde system is excellent - just like domestic home central heating, with boiler, room thermostat, radiators, and towel rail. Amazingly efficient considering all the rads are behind furnishings. There is an all round warmth even in sub-zero conditions, let alone cold nights
I've never had any servicing trouble (with two vans) and, in any event there are plenty of service/repair agents.
You will find that generally the system is only fitted to top-of-the range vans, boats, etc - enough said...!
If you haven't already done so, see http://www.alde.co.uk/