Yes I have this system in my Bessacarr. Its very flexible, since it can run off 1Kw, 2Kw mains electricity, or gas, or both!. Its very effective indeed at keeping you cosy. The programmer is different from a domestic system. There is timer with multiple on/off options which is conventional. However, it is designed to be always 'on', because the timer alters the temperature on the thermostat, rather than switching the unit on or off. So you might set it for 20C in the evening and 16C in the night - if the temp falls below 16C, the system will come on....There is no 'advance' button either-you raise the temp instead.
The system is filled with a car antifreeze mixture so no problems there.