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steam boiler sizing

Here's an easy one. quoting a steam boiler replacement where the load is 211 EDR. the boiler also has a hot water baseboard loop off the main vessel. not a coil or other heat exchanger. the baseboard is 18000 BTU. how does this get figured into the equation? what size boiler will handle this combined load or do i only size for the 211 EDR?

Comments

  • Jamie HallJamie Hall Posts: 9,758Member
    edited December 2018
    Size for the EDR. That has a pickup factor built into it (at an EDR of 211, it would around 60,000 BTUh). In the unlikely possibility that both the hydro zone and the steam system are calling together, the pickup will be ample to feed the system. If they both start exactly together (even less likely!) all that would happen is the boiler would come up to steam a little slower.
    Jamie



    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.



    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • EBEBRATT-EdEBEBRATT-Ed Posts: 4,969Member
    edited December 2018
    What @Jamie Hall said

    Hot water load cannot exceed your pick up factor which yours does not so your good.
  • Dave0176Dave0176 Posts: 1,018Member
    edited December 2018
    > @dobro23 said:
    > Here's an easy one. quoting a steam boiler replacement where the load is 211 EDR. the boiler also has a hot water baseboard loop off the main vessel. not a coil or other heat exchanger. the baseboard is 18000 BTU. how does this get figured into the equation? what size boiler will handle this combined load or do i only size for the 211 EDR?

    You only size for the 211 EDR, do not add extra for the hot water loop.
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