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.
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