extra btu needed for indirect water heater?

BOB_23 · October 2003

i am doing a boiler job with 4 apartments with 5 heating zones and one 80 gallon indirect water heater. all heating zones and the indirect will be zones with circulators. i need 225,000 net btu for the heating zones. the indirect water heater will require 140,000 net btu. i will zone with circulators and a argo control that can prioritize the indirect water heater. if i do the job this way do i still need to add the 140,000 btu to my heating zones load? thanks foy your input.

Joe_13 · October 2003

No

With that many BTU's, you'll probably be on priority for the tank for a whole 10 minutes unless all 4 showers and a dishwasher are going at full steam.

Unknown · October 2003

do not add

You don't add the DHW to the load. It is prioritized over heating.

Make sure you size the circulator and HX loop accordingly.

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kevin coppinger_4 · October 2003

besides...

that 240k is baseed on the coldest days of the year...what 8-10 days out of a 261 day heating season...priority will do the job nicely.

extra btu needed for indirect water heater?

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