Installation Drawings - HTP - Water and Space HeatingExplore further
2014-7-21u2002·u20022. Boiler circulator(s) must be rated for open loop applications. Do not use cast-iron circulators. 3. Boiler circulator(s) operate continuously. 4. The minimum pipe size for connecting to a water storage tank is 1 ½'. 5. The minimum pipe size for connecting the boiler is 1 ½' for the Mod Con 300 VWH and 2' for the 500 and 850 models. 6.
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