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Note: in Massachusetts, the following must be done:
Tempered potable water must meet temperatures in 248 CMR.
All water piping must be insulated in accordance with 780 CMR (Massachusetts energy code).
50 feet maximum distance from water heater to space heating load (developed length).
Piping loop between water heater and heating load must be in compliance with 248 CMR.
All circulators must use an electronically controlled timer that activates every 6 hours for 60 seconds.
Figure 7. Recommended Piping for Combination Water and Space Heating Applications.