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Old Boiler Heated Better than New boiler

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Dairon421
Dairon421 Member Posts: 80
I installed a new boiler 21 days ago. The radiators was hot when I left after the install. It's a two family flat. The down stairs radiator are fine but the upstairs tenant complaints that the old boiler heated better and at night time the heat doesn't kick back on. Upstairs radiator is hot but you can keep your hand on it for a while before it gets to got. The thermostat (80 degrees thermostat location)is downstairs with radiator next to it. I have Hoffman air vents, so I just the small orfices near the thermostat on first floor and put the bigger sizes on the second floor. Idk if that will solve the problem or not. Have you guys ever had this problem where the old boiler heated better and why if the new boiler are more efficient 

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  • SuperTech
    SuperTech Member Posts: 2,197
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    Post some pictures of the boiler and the near boiler piping.  Model information for the boiler would help. How was sizing of the new boiler determined?
    Dairon421MaxMercy
  • Dairon421
    Dairon421 Member Posts: 80
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  • Dairon421
    Dairon421 Member Posts: 80
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    160,000 steam and we did edr  on radiator. The return was copper already 
    SuperTech
  • MaxMercy
    MaxMercy Member Posts: 514
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    Dairon421 said:

    Have you guys ever had this problem where the old boiler heated better and why if the new boiler are more efficient 

    Same BTU output?

    A more efficient boiler of the same size will output the same amount of heat but use less fuel doing it.

    Unrelated, but I'd move the thermostat to the other side of the wall.
    MikeAmann
  • bburd
    bburd Member Posts: 925
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    Did you change the thermostat? If so, is it compatible with steam heat? Many of the digital models either are not because the heating cycle is too short,
    or have to be adjusted for steam or gravity hot water systems that need a longer cycle than forced air.

    Bburd
  • mattmia2
    mattmia2 Member Posts: 9,828
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    Where is the return? Is the return a drip before the main turns down and connects to the header?
  • Dairon421
    Dairon421 Member Posts: 80
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    mattmia2 said:
    Where is the return? Is the return a drip before the main turns down and connects to the header?
    Yes the returns are fine didn't get a picture but they are properly pitched 
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 8,153
    edited December 2022
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    Did you get a new thermostat? Is it a digital display thermostat?

    Steam boilers need the Cycle Per Hour (CPH) changed. You can change it in the setup menu. It should be no higher than 2 CPH but sometimes 1 CPH is better.

    If it happens to be a bimetal coil type (rare but still available) the heat anticipator may be set incorrectly.

    What thermostat is connected to the boiler? Picture please!

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

  • pedmec
    pedmec Member Posts: 994
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    First make sure main vents are working so the system has a better chance at balancing.You can be restricting the venting of the main with a bad main vent and the steam will find the shortest path which tends to end up being the first floor. Then i would consider moving thermostat. Was anything changed except the boiler?
  • Dairon421
    Dairon421 Member Posts: 80
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    Did you get a new thermostat? Is it a digital display thermostat? Steam boilers need the Cycle Per Hour (CPH) changed. You can change it in the setup menu. It should be no higher than 2 CPH but sometimes 1 CPH is better. If it happens to be a bimetal coil type (rare but still available) the heat anticipator may be set incorrectly. What thermostat is connected to the boiler? Picture please!
    This the type we use
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,710
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    Bouncing water level? Has it been skimmed? Tripping on pressure or LWCO may not be getting a long enough run time to heat the 2d floor
  • NYLamb
    NYLamb Member Posts: 10
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    Start the boiler and stand by the upstairs radiator. Vent may not be venting @ startup leaving you with an air-bound radiator. 
  • Steamhead
    Steamhead Member Posts: 16,932
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    @Dairon421 , I see you have the new system takeoff feeding into a much larger vertical pipe. I'd bet condensate is forming in that reducing coupling, choking the steam back. Wouldn't be the first time I've encountered that.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
    mattmia2SuperTech
  • mattmia2
    mattmia2 Member Posts: 9,828
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    I don't seem to see a hartford loop. The water line may be lower so if there are water seals out in the system they may no longer be functioning.
  • HVACNUT
    HVACNUT Member Posts: 5,870
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    mattmia2 said:
    I don't seem to see a hartford loop. The water line may be lower so if there are water seals out in the system they may no longer be functioning.
    It's there. You can tell by the hammering.