Please ensure Javascript is enabled for purposes of website accessibility

We are closed on Friday, July 4th, 2025 for Independence Day weekend and reopening Monday July 7th, 2025. Enjoy and be safe.

  • Sign In
  • Create an Account

Need Help?   Email:

Toggle Nav
Cart Icon Cart
Search
We ship to most places in continental USA
Chat with us
Need help
Our Locations

Natural Gas Boilers

Mbtu

Fuel Type

Medium

Brands



Items 1-36 of 576

Set Descending Direction

  4. Saint Roch S10 Series Boilers
    Gas, Water
    Cast Iron
    Chimney/Direct vent
    87% Efficiency
    Limted Lifetime Warranty
    Saint Roch SR-S107H S10 Series, 207 Input MBtu, 87% AFUE, Oil Fired, 7 Section Water Boiler, with Trim (Knockdown Boiler- Assembly is Required)
    Retail : $3,450.00 $2,511.60
    You Save (27%)

    • Saint Roch SR-S103H S10 Series, 73 Input MBtu, 87% AFUE, Oil Fired, 3 Section Water Boiler, with Trim (Knockdown Boiler- Assembly is Required)

    • Saint Roch SR-S104H S10 Series, 105 Input MBtu, 87% AFUE, Oil Fired, 4 Section Water Boiler, with Trim (Knockdown Boiler- Assembly is Required)

    • Saint Roch SR-S105H S10 Series, 146 Input MBtu, 87% AFUE, Oil Fired, 5 Section Water Boiler, with Trim (Knockdown Boiler- Assembly is Required)

    • Saint Roch SR-S106H S10 Series, 169 Input MBtu, 87% AFUE, Oil Fired, 6 Section Water Boiler, with Trim (Knockdown Boiler- Assembly is Required)

    • Saint Roch SR-S107H S10 Series, 207 Input MBtu, 87% AFUE, Oil Fired, 7 Section Water Boiler, with Trim (Knockdown Boiler- Assembly is Required)

  9. Lochinvar Knight XL Series Gas Boilers with Firing Controls
    Natural Gas
    Stainless Steel Heat Exchanger
    Direct Vent
    Lochinvar KBX1000N-M13 Knight™ XL 1000 Input MBtu Natural Gas with High & Low Gas Pressure Switches with Manual Reset, M13 (Firing Control) 100341177
    Retail : $45,314.00 $32,077.78
    You Save (29%)

    • Lochinvar KBX0500N-M13 Knightâ„¢ XL 500 Input MBtu Natural Gas with High & Low Gas Pressure Switches with Manual Reset, M13 (Firing Control) 100341191

    • Lochinvar KBX0650N-M13 Knightâ„¢ XL 650 Input MBtu Natural Gas with High & Low Gas Pressure Switches w/Manual Reset, M13 (Firing Control) 100341192

    • Lochinvar KBX0800N-M13 Knightâ„¢ XL 800 Input MBtu Natural Gas with High & Low Gas Pressure Switches with Manual Reset, M13 (Firing Control) 100341182

    • Lochinvar KBX1000N-M13 Knightâ„¢ XL 1000 Input MBtu Natural Gas with High & Low Gas Pressure Switches with Manual Reset, M13 (Firing Control) 100341177

  11. Williamson GWA Series 3
    Gas, Water
    Cast Iron Heat Exchanger
    Chimney Vent
    84% Efficiency
    https://www.afsupply.com/media/attribute/swatch/swatch_thumb/110x90/p/a/packaged_1_1.png
    Packaged
    Williamson GWA-233-N-T-S3-W GWA Series 3 233 Input MBtu 84% AFUE Natural Gas Atmospheric Vent, Package Water Boiler, Taco 007, LWCO, Draft Hood Included
    Retail : $5,576.00 $3,457.12
    You Save (38%)

    • Williamson GWA-038-N-T-S3-W GWA Series 3, 38 Input MBtu, 84% AFUE, Natural Gas, Atmospheric Vent, Water Boiler, Taco 007, LWCO

    • Williamson GWA-067-N-T-S3-W GWA Series 3, 67 Input MBtu, 84% AFUE Natural Gas, Atmospheric Vent, Water Boiler, Taco 007, LWCO

    • Williamson GWA-100-N-T-S3-W GWA Series 3, 100 Input MBtu, 84% AFUE, Natural Gas, Atmospheric Vent, Water Boiler, Taco 007, LWCO

    • Williamson GWA-133-N-T-S3-W GWA Series 3, 133 Input MBtu, 84% AFUE, Natural Gas, Atmospheric Vent, Water Boiler, Taco 007, LWCO

    • Williamson GWA-166-N-T-S3-W GWA Series 3, 166 Input MBtu, 84% AFUE, Natural Gas, Atmospheric Vent, Water Boiler, Taco 007, LWCO

    • Williamson GWA-200-N-T-S3-W GWA Series 3, 200 Input MBtu, 84% AFUE, Natural Gas, Atmospheric Vent, Water Boiler, Taco 007, LWCO

    • Williamson GWA-233-N-T-S3-W GWA Series 3 233 Input MBtu 84% AFUE Natural Gas Atmospheric Vent, Package Water Boiler, Taco 007, LWCO, Draft Hood Included

  16. Laars Pennant Series water Boiler
    Gas, Water
    85% Efficiency
    Laars PNCH-1500 Pennant™1500 input MBtu 85% AFUE Hydronic Water Boiler
    Retail : $40,254.00 $30,190.50
    You Save (25%)

    • Laars PNCH-500 Pennant 500 Input MBtu - 85% AFUE Commercial Natural Gas/Liquid Propane Water Boiler - Direct Vent

    • Laars PNCH-750 Pennant 750 Input MBtu - 85% AFUE Commercial Natural Gas/Liquid Propane Water Boiler - Direct Vent

    • Laars PNCH-1000 Pennant 999 Input MBtu - 85% AFUE Commercial Natural Gas/Liquid Propane Water Boiler - Direct Vent

    • Laars PNCH-1250 Pennant 1250 Input MBtu - 85% AFUE Commercial Natural Gas/Liquid Propane Water Boiler - Direct Vent

    • Laars PNCH-1500 Pennantâ„¢1500 input MBtu 85% AFUE Hydronic Water Boiler

    • Laars PNCH-1750 Pennant 1,750 Input MBtu - 85% AFUE Commercial Natural Gas/Liquid Propane Water Boiler - Direct Vent

    • Laars PNCH-2000 Pennant 1,999 Input MBtu - 85% AFUE Commercial Natural Gas/Liquid Propane Water Boiler - Direct Vent

  19. Peerless MI Boilers
    Gas, Water
    84% Efficiency
    Peerless 01301 MI-E-03-SPRK-WPC-N-4200 MI-e® 70 Input MBtu, 4.72 Gallon, 84% AFUE Residential Natural Gas Water Boiler, Chimney Vent
    Retail : $3,686.00 $2,764.50
    You Save (25%)

    • Peerless 01301 MI-E-03-SPRK-WPC-N-4200 MI-e® 70 Input MBtu, 4.72 Gallon, 84% AFUE Residential Natural Gas Water Boiler, Chimney Vent

    • Peerless 01401 MI-E-04-SPRK-WPC-N-4200 MI-e® 105 Input MBtu, 6 Gallon, 84% AFUE Residential Natural Gas Water Boiler, Chimney Vent

    • Peerless 01501 MI-E-05-SPRK-WPC-N-4200 MI-e® 140 Input MBtu, 7.28 Gallon, 84% AFUE Residential Natural Gas Water Boiler, Chimney Vent

    • Peerless 01601 MI-E-06-SPRK-WPC-N-4200 MI-e®175 Input MBtu, 8.56 Gallon, 84% AFUE Residential Natural Gas Water Boiler, Chimney Vent

    • Peerless 01701 MI-E-07-SPRK-WPC-N-4200 MI-e® 210 Input MBtu, 9.84 Gallon, 84% AFUE Residential, Natural Gas Water Boiler, Chimney Vent

    • Peerless 01701 MI-E-08-SPRK-WPC-N-4200 MI-e® 245 Input MBtu, 9.84 Gallon, 84% AFUE Residential, Natural Gas Water Boiler, Chimney Vent

    • Peerless 01901 MI-E-09-SPRK-WPC-N-4200 MI-e® 280 Input MBtu, 12.4 Gallon, 84% AFUE Residential, Natural Gas Water Boiler, Chimney Vent
Page
per page

Shop By
Shopping Options
Availability
Product Group Name
Burner
Coil
Pump
Water Heater Type for Top Filters
Discount% Range
Manufacturer
BTU Input Range
Fuel Type
Series
Price
OK

By using this site you agree to our Terms, Conditions of Use and Privacy Statement © 2025 AF Supply Corp. All Rights Reserved.