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i have a savio boiler supplying my indirect domestic hot water tank (dhw works fine) and my radiant. my radiant side has an injection and a radiant pump (both grunfos with three speed settings) my control box is a tekmar 356 my house is very tight and has 5 zones.
basement- slab with bamboo flooring, 6 loop manifold
upstairs tile and bamboo - 2 zones are 2 loop manifolds, 1 zone is a five loop manifold, and one zone a three loop manifold (all tubing lengths are in the 300 ft range using 1/2 inch pex
i have the option of outdoor reset and setpoint control. i was told while using the outdoor reset to put the injection on the high setting and the radiant on the medium setting. this causes supply and return temps to be virtually the same and my boiler cycles constantly. when the radiant pump is on the low setting it works better and gives me slightly higher supply temps than the return temp, although it doesn't gain very quickly at all and i still have frequent boiler cycling and pumps run a lot .when using the setpoint control method and using a target temp of 130, with the radiant pump speed on low, it seems to work well,and heat quickly is this a good method?