Hyco are a electrical company in Castleford, think the whiteunit maybe a water heater?
http://www.hycomanufacturing.co.uk/index.asp
The unit is def aftermarket fit, given the mix of copper fittings and compression fittings
the green 'spout' looks like a common garden hose connector, so if you are on a
premium/euro pitch with mains water, you connect your hose to the tap and this connector.
I would attach a hose and turn the tap then water heater and pump on , then run around the inside of the van like a mad man checking for leaks.
Do you have any other method of getting water and heating it in the van?
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