A hydronic system is to be designed to supply four
panel radiators, each with its own thermostatic radiator valve, and an indirect
water heater from a gas-fired sectional cast-iron boiler.
tekmar Control Systems introduces the tekmarNet Thermostat 557, a communicating touchscreen thermostat designed to operate either a hydronic radiant floor with a two-stage heat pump for heating/cooling and a backup heating system, or two stages of heating and two stages of cooling.