I've had the Tagaki unit in my house for about 5 years. It's works better than I thought. It has no trouble keeping up with demand in my house. Although, it takes alittle longer for the hot water to arrive at the particular fixture. My basement is 90% finished living space so the original 40...
I've bought bits and pieces from them with no problems what-so- ever. They wanted me to use the polaris heater but since I only had electric I couldn't use it. I got the heater from somewhere else. Got my system working today and it's working great!