Purchased a Smarttek Black hot water system just before Easter. The unit has an intermittent problem where it can be set to run at a certain water flow to achieve a 38 degree shower that will work but will flame out some times in future attempts to have a shower with these same settings. It is not a set and forget system like you would expect. I returned the system to Tent World to get a refund or a replacement unit but I found myself having to deal with Smarttek who have been quite poor in their response to the problem. They initially blamed the D cell batteries supplied with the unit because of the time the unit sat on the Tent World shelf (6 months). New batteries made no difference. This is a DOA item that has left me looking to follow up on my consumer rights with this product. To be fair, the Tent World staff have been very friendly which is the reason I've given the review an extra star