Heating and hot water

[bluebus1987]

Thats what a calorifier is. A coil in a cylinder. On utilities vehicles they fill em up with a watering can for hand washing on site. I paid about 30 quid for one. Plumbs into the heater pipes. If you have a water heating webersbacher it will do it on site when your parked.

[Oldiebut goodie]

Webasto Dual Top is designed for the job, RHA 100 or an Evo being the more modern one.

[garyd]

Shaun,
one route would be this.

CAK Tanks - http://www.caktanks.com/CAK_Water_Tanks_Accessories.htm, download the catalogue and go to page 18. There is a slide under tank with a side filler which might suit you. Otherwise, the previous pages list all sorts of shapes and sizes.

Then, thinking back to the Boundary Tec shower heater we saw at the weekend, form a coil from 1/2 inch copper pipe that will go in through the filler neck. Use two bulkhead fittings such as this http://www.screwfix.com/p/p921-1-tank-c ... 15mm/82376to pass the ends through the tank wall. Fit the heater hoses to the ends. The fittings will need to be drilled out to allow a single pipe to pass right through. You will probably want a valve of some sort to restrict the flow so that it doesn't bypass the front heater and also as a form of temperature control.

Depending on where/how you mount it, it could be filled directly through the filler neck or use another bulkhead fitting to lead a supply pipe into the tank. Lastly, another bulkhead fitting to connect a draw off pipe using a pump to a tap.

[Winchweight]

That sounds like it could work?

[Oldiebut goodie]

Here you go!
http://www.ebay.co.uk/itm/motorhome-cam ... SwHsRYDl~A