Hydronic Heating Supplies and 5 Loop Radiant Manifold connected to a Hydronic Boiler. You will notice that there are both high and low temperature zones in this heating system. Some for Pex Radiant Heating and other high tempeature zones such as an indirect hot water storage tank. The Gas Boiler on the right is connected via the pump controller and each zone's thermostat. This system is put together very well with temperature gauges and ball valves for later maintenance.