Just for others reading this, I think it is only if you put the system onto heating the water at the higher than normal temperature that it takes priority over the central heating. Normal water heating takes place alongside the central heating - at least that's how mine works.
Just had 7 nights near Sedgefield, Co Durham with a beautiful view over the meadows, 16 amp, water and grey waste on pitch for £14 per night or, in winter, £10 with no hookup. Given that my regular haunt in Anglesey charges £35, it sounds OK but the £35 one does have showers and loos plus grounds in superb condition etc.
Well be amazed if you wish but I have used them for my last two 'van purchases and am thoroughly pleased with their service. Slightest problem with van sorted at my earliest convenience to my complete satisfaction. Very pleasant and helpful staff.
I have a LockNlevel air bag (£199 not £250!) but many people use the standard levellers and tie the two together at the correct distance apart so that the first wheel goes up and over the first ramp and then just continue until required height is reached.
First for me was a Triumph 2.5PI - lovely engine; awful cooling; rhubarb PI system or rather the pump. It was also my first new car which I picked up ex-works in London (an arrangement for military) during a couple of days break from one of my tours in Northern Ireland. I fitted an ammeter after a while (everyone did in those days!) but my poor connection came loose one night on a dark country lane - no fun!