I would rather pay another £40 for Peter Fogwill's heater.
You still need a gas bottle, gas, regulator and gas supply hose. Peter's unit is 6litres per minute, this one is 2.5 litres per minute. Peters will work with the pressure of WFP pumps. This one has it's own pump, which will be enough to pump a flow of water to a shower head.
Unit cuts out if water supply is interupted. What does this mean for us?
Spruce