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Member Posts: 153
this is just the kind of feedback I was looking for. Thanks. Mark S.

• Member Posts: 153
Bradford-White Combi 2 gas/LP DHW and Heating

Has anyone had any experiences with this unit (gas/LP)? The specs seem to show a hydronic heating output of 55k BTU. But what might happen if one needed DHW at the same time. And if reset was desired, would it have to be incorporated in the heating loop. thanks for any replies. Mark S.
• Member Posts: 6,719
I learned the hard way..........................................

• Member Posts: 21,866
55,000

BTU is just that. You can't have it twice if the heating load is 55K and the DHW load needs 55K.

Calculate how many BTUs you need for dhw, and how often. The balance is available for heating.

Here is the formula for DHW= 8.33 (gallons required per day) (Th-Tc)
Tc = temperature of incoming water
Th = setpoint temperature of hot water

Consider 20 gallons per person for the first two people, 15 gallons per additional people. So a family of 4 = 70 gallons per day. Rule of thumb of course.

Then calculate the output of the baseboard at the temperature and flow rate and see how the numbers line up.

The biggest unknown is how much and how often you need DHW.

hr
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream
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