I have a few questions to ask. The house we bought last spring has a tankless water heater (E.L.M. Aqua Star)in it, it seems in the winter it doesn't heat the water that good. And to take a shower you have to have the water on some where else for the water heater to come on to heat the water. If you have any answers to my questions it would be helpful. Also if you can tell me of where to get information as for maintenance on the E.L.M. Aqua Star. Thanks.