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For a little background. This is a new system in a new 3400 sq. f.t super insulated home located in upstate NY. I know just enough about heating systems to be dangerous so have to keep this in laymans terms. There is no issue with the system heating the house it handles that with ease and trust me this it is getting tested it's been a very cold winter so far with significant winds from the north. This house is set on a lake and takes full north winds with no break for miles. I am very impressed with the heating. If a few people are working the temp will come up 2 to 3 degrees above the thermostat.
The system: The largest Buderus GB they build I think it is a 160. 4 zone system, hot water is handled through an on demand so not off the boiler. One zone is baseboard radiation this is for the 2nd floor, the other three are ground floor with in floor. One for the entire 1st floor, one for the garage and one for a snow melt system in the driveway. The snow melt is another whole issue in itself but for now thats not a priority so I am not using it.
The idea when building the system was. Fire the boiler at 185 to run the baseboard loop then use mixing valves to temper it for the in floor. First, can this be done or more importantly should it be done?
What I am having a problem with is tempering the water to the in floor. The mixing valves do not seem to be able to cool it enough for the infloor. If we turn them all the way to full mix it all but stops the GPM. It is coming in at the 185 and we can only get it down to 160. The GPM is running .6 to .75 but touch the mixer and it all but stops.
I know your going to need more info and I will have to get whatever you need so please ask.
Thanks in advance