I think the water heater you have looked at on ebay is the eco temp L6 ? I have been using the L5 for at least the last four years, I inported it from the US. Good points it heats water and was quite easey to install. Bad points because its a open vent you have to leave at least one door open so it is vented. You also have to run at a high flow rate for it to work . I find a 19kg bottle of lpg lasts me an average of five weeks £39 ish from a normal outlet, but I get mine from a catering frend £21. Adam