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2. 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.
All About Hydronic Multiple Boiler Systems | Industrial
If, for some reason, the piping from the primary loop to the boilers begins to approach a total of 80 feet or more, 1-1/2" pipe should be used. (Supply and return lengths are added together to get a total length.) Now, let’s deal with the primary loop: Using Figure 3, we find the primary loop will be 2" copper pipe.
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