I’m trying to evaluate whether there is something wrong with the heating system in our vacation home. The home is in Pacific Grove, CA, which has some of the mildest weather in the world, since it is right on the Pacific next to Monterey Bay. Still, we need to heat it sometimes, since the temperatures at night can get into the 50’s and even high 40’s. We recently remodeled the 1200 sq foot building and due to California title 24 requirements, had to put in a super-efficient hydronic heating system. We have 3 heating zones in the unit, one for the main living area, one for the master bedroom and one for the second bedroom, each with their own Ecobee thermostat. Each zone pipes hot water to 2-3 fan convectors to heat the area. But the heating seems incredibly slow. It can take 8 hours, in the case of the living area to increase the room temperature 7 degrees, though with the outside temperature dropping by 10 degrees.
The graph below shows the 5 longest heating runs during the past month. Solid lines represent the room temperature minus the thermostat temperature (the number of degrees left before the room reaches the temperature the thermostat is calling for). The dotted lines are the difference between the outside temperature and the room temperature. Should it really take 8 hours to heat a room by 7 degrees ?
Graphs for the two other zones that are on the same boiler, and same boiler temperature below.