Ok here goes it! I'll try my best to help. First, Call Chris Rojas at Carwashboilers.com. The man helped me over the summer preparing for the winter months. I have had 3 Paloma tankless heaters since opening in July of 2005. Every time I turned on the tanks during the winter months I would lose volume to all my chemicals which I heat. The tankless water heaters only produce around 5GPM and it wasn't enough water flow when all valves were open durning busy days. In 2013 with the polar vortex, we had a freeze up with temps getting around 35 below 0. All tanks froze and pipes burst. What a mess. Clean up was easy but dealing with Insurance was a nightmare. That's another story. I installed 3 Navien Tankless water heaters and repalced piping with Pex, which was not a good idea. It reduced the size of the diameter of the pipes and made the previous problem worse along with water restricted through 5GPM in the tankless heaters. I showed Chris the problem and he recommeded a reserve 50 gallon that holds the hotwater and when the demand is needed there is also a pump on my 2 inch main that boosts the volume. Not a booster pump but a pump to my tank. I'll try to post pics. Since install from Chris's recommendation, no problems. Also, install a by pass in case hot water tanks fail.
