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New Biasi B10-5 not saving me any money in oil

razzorrazzor Member Posts: 14

Had a new Biasi B10-5 boiler with Riello F5 installed in November but using as much oil as my old V75 Burnham boiler. WTF. Plus it runs quite often. I have an Indirect tank not on a priority zone. Not sure if the Hydrostat 3250 is set up right. 7 zones including indirect. Any help would be appreciated.


  • Jamie HallJamie Hall Member Posts: 12,844
    Probably won't save you much, if the old Burnham was set up right. Both boilers will max out at somewhere around 85% efficiency on a good day, and a BTU is a BTU.

    How often it runs is entirely related to the total mass of the boiler and the water -- and, more importantly, the controls and the way they are set up. How long, all told, it runs isn't. That's a function only of how much heat does your structure lose -- assuming both boilers are of equal efficiency which, as noted above they probably are.

    I hope you didn't swap out the Burnham hoping to save a lot of money on oil... because you won't.
    Br. Jamie, osb

    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
  • GrallertGrallert Member Posts: 443
    That Biasi is a lower mass boiler, it contains less water and less cast iron so the burner is going to come on more often in order maintain a water temperature during a call. Unfortunately swapping a boiler out only saves fuel if the old boiler is terribly inefficient. or less efficient than the replacement. Those F5 Biasi combinations are loud in my experience. Insulation, or insulated window shades, better windows more radiation are things that could help.
  • jimna01jimna01 Member Posts: 4
    Equipment owner here . My Basi (rebranded as a Solaia ) has been chugging along 14 years now with zero issues. Mine reduced my oil consumption by nearly 30% only because it replaced a circa 1960 Crane Sunnyday beast. Three zones with indirect DWH
  • STEVEusaPASTEVEusaPA Member Posts: 4,132
    7 zones. Was a heat loss done and equipment properly sized.
    Maybe a buffer tank would help with the short cycling.
    What does your original installer have to say?
  • HVACNUTHVACNUT Member Posts: 3,349
    You should have the 3250 Plus. Use the manual to go through the settings. Is it using the economy setting?
    The water heater needs to be wired from the DHW circulator hot in parallel with ZR in the Hydrostat.
    IMO you should definitely see saving in consumption.
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