at the end of the day im sooooo glad im not using a cheapo gas shower heater anymore!
if your earning the money then invest and buy a decent hot system if you want hot water all year round (with frost protection)......
other trades spend thousands on their tools,much more than us window cleaners yet most guys baulk at the thought of spending a few grand on a professional set up.....
if i could have afforded it id of bought a professionally fitted diesel heater YEARS AGO!THEIR ACE!
rather than messing about with cheap DIY installs........you live and learn i suppose.....its been a journey!