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What Gas Boilers Are Manufactured In The U.S.A.?

Sorta Member Posts: 46
I would like to buy American with my next gas boiler purchase. A boiler actually manufactured in the United States (not one made that is actually foreign-manufactured, but re-labeled and sold by an American company. My understanding is that this sometimes happens, like the Kiturami (Korean made) combi-gas boiler being relabeled as Laars, Nortiz, etc)

So, what gas boilers are actually manufactured in the United States? (And as an aside, do you prefer a certain manufacturer?)

Thanks all.


  • Steamhead
    Steamhead Member Posts: 16,902
    Are you talking cast-iron or mod-con? Except for Buderus, Vie$$mann and the various Biasi-based ones, most cast-iron ones I know of are made here.

    Mod-cons are a different story. Now that Slant/Fin is gone, it's hard to tell what's made where- even with storied American brands like Weil-McLain or Burnham. You'll need to do some digging.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
  • Sorta
    Sorta Member Posts: 46
    Thanks Steamhead. I was thinking of both cast-iron and mod-con actually. I want to keep my options open. Stinks to her that with mod-cons...it isn't often straight-forward as to where the boiler itself is manufactured.
  • EzzyT
    EzzyT Member Posts: 1,296
    The only modcon boiler that I can think of that is fully manufactured in the US is Energy Kinetics Accel. Plus they have the best customer service along with the best tech support. 
    E-Travis Mechanical LLC
    Robert O'BrienRogerszwedjRich_49
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,052
    edited April 2023
    Lochinvar is made in Tennessee I believe, except for the heat exchanger which comes from Europe. Great boiler!
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • Tim_D
    Tim_D Member Posts: 128
    I am unaware of a MODCON that is 100% made in America or even North America. Some are assembled here while others are completely manufactured offshore and just rebranded.
    Mad Dog_2
  • hot_rod
    hot_rod Member Posts: 22,262
    I doubt there is any boiler that is 100% made in the US.
    Electronics, transformers, switches, relays, brass trim, gas valves even the wiring itself could be sourced off shore.

    I think many of the casts iron blocks are still cast here for Weil McLain, US Boiler/ Burnham, Dunkirk, Utica, maybe Crown/ Velocity.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Solid_Fuel_Man
    Solid_Fuel_Man Member Posts: 2,646
    The thing about mod/cons and the HX made by a big HX manufacturer is that the HX manufacturer has hundreds of thousands of HXs across the world in many boilers. That almost says more than one which is made in-house. It has it advantages as well as disadvantages. 

    When I worked in the automotive industry, outsourcing was sometimes a positive thing. Like when a manufacturer really couldn't make a decent automatic transmission..... then they would use a global source for their automatics and would be much better. Aisin, and ZF come to mind. 

    That said, I've used Weil McLain mod/cons as well as NTI which both use the popular AIC (Poland) made firetube HX. Very well made. 
    Serving Northern Maine HVAC & Controls. I burn wood, it smells good!
  • psb75
    psb75 Member Posts: 845
    Triangle Tube is an American Co. in NJ that if famous for making heat exchangers. They were making mod/con boilers for quite a while. I think they still are but there is a line of theirs now named "Ideal" that are made in the UK. So...its a bit confusing. Here is another factoid: Viessmann is the largest boiler manufacturer in the world. I think they make very, very good equipment. Buderus is out of biz. Rolled into Bosch. I believe.
  • jumper
    jumper Member Posts: 2,289
    Frankly I do not understand how so many manufacturers survive in the world?
    Shrinking market for product that can last for decades.