I swear I saw something about this on here before but I cannot find it... I'm working on an add-on to a new install that will make me $0 but will save time and make scheduling easier in the future. for about $200 the plumber will install one of these... http://leightonstone.com/watts/backtws.html I'll also install an outdoor timer instead of the usual indoor inside the garage. The selling point is that they don't need to be as concerned about being home in the future for appointments. Hopefully some people will appreciate it... I can't do it for any cheaper, it's only the added cost of the parts. anyone do systems like this?