Planning wrote:
kedanie wrote:
Any tankless system can only raise the water temperature by a certain amount, so if the incoming water is real cold then the max temperature output will suffer some.
Keith
Keith, if you are obtaining less than optimum temperature control I would encourage you to examine the Truma system. We have not had that experience with ours. We have had consistent 120f water temperature even with 38f incoming.
The Truma uses microprocessor-controlled stepless burner management that adjusts the heat output from 20,000 to 60,000 BTU based upon incoming temperature and flow rates.
No, we are not having any problems with our water heater!
The Precision Temp unit has the same type of controls as the Truma unit. Since the Truma appeared after the Precision Temp, it appeared to me that they are a copy of the Precision Temp design. Take a look at both units side by side and you will be surprised at how close their design is.
The facts about these units are that they do have limits as to the temperature rise they are capable of. Look at the specifications for your unit, it will be in there. When there is low pressure and flow they can't run at full bore on the burner, hence the low flow problems. When we experience the low pressure issues, we simply change over to the on board pump and keep on going. The park we stay at in Arizona occasionally has their pressure drop to around 35psi.
People often complain about wasted water waiting for the hot water. Well, they will have the same problem with their tank unit as one still has to wait for the hot water to get there. The longer the distance from the water heater the longer the wait.
Keith