Originally Posted by TrustedHandyman
I'm looking for some ideas for suggestions.
A client of mine had a tankless water system installed last summer. They love it. It works great. Now that the winter is here, not so much. They can not get the same hot temperature as before. After having it serviced they were told by the serviceman that the problem related to the drop in the incoming water temp due to the winter. Not to argue weather that's true or not, I am looking for a solution.
I have a Bosch tankless water heater (800 ES). You can "pre-heat" the incoming water (up to 140 degrees) via a variety of methods. One is to use the draining water to heat up the incoming supply (the copper line systems are like $140). You can also use a mini-tank. I run my hot water incoming lines and outgoing lines near in-floor radiant heat lines.
Or you can upgrade the unit to something more powerful.