<center><a href='https://dtube.video/v/patricksbc/7dsyx039'><img src='https://ipfs.io/ipfs/QmcQDhzLCm54VnnpRvWfuDYtyEBiiqwBrFxVn1bJ4W4CfX'><h2>Watch Put a hot water heater/shower system on the roof of your vehicle... video on DTube</h2></a></center><hr>You could make one for very cheap if you bypass the pressuring.  You would still have a hot water tank, with enough flow to take a hot shower.