Bradford White TGHE-199I-N - Manual (Page 21)

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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.