JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser.

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

Toggle Nav

Search

We ship to most places in continental USA

Chat with us

Need help

Our Locations

Home
HVAC
Boilers

Boilers

Green Mountain X Laars X

Mbtu

Fuel Type

Medium

Water
Steam

Brands

Green Mountain GMSBO Series

Oil-Fired, Steam

Cast Iron Heat Exchanger

Chimney Vent

85% Efficiency

Without Burner
Retail : $5,030.00 $2,877.16

You Save (43%)
Green Mountain SBO310521700104 GMSBO 147 Input MBtu - 85% AFUE Oil-Fired Steam Boiler - Chimney Vent (Burner Sold Separately)
4624.002644.93
147 MBtu
SBO-3
In Stock

Green Mountain SBO415021700104 GMSBO 210 Input MBtu - 85% AFUE Oil-Fired Steam Boiler - Chimney Vent (Burner Sold Separately)
5030.002877.16
210 MBtu
SBO-4
In Stock
Qty:
Laars Mascot Ft Series Combi Boilers (Floor Standing)

Gas, Water

Stainless Steel Heat Exchanger

Direct Vent

95% Efficiency

Combi Boiler
Retail : $5,491.00 $3,843.70

You Save (30%)
Laars MFTCF140NA1XN Mascot Ft 140 Input MBtu Natural Gas/Liquid Propane Floor Standing Condensing Combi Boiler - Direct Vent
5235.643664.95
140 MBtu
MFTCF140NA1XN

Laars MFTCF199NA1XN Mascot Ft 199 Input MBtu Natural Gas/Liquid Propane Floor Standing Condensing Combi Boiler - Direct Vent
5491.003843.70
199 MBtu
MFTCF199NA1XN
Qty:
Green Mountain GMCB Series

Gas, Water

Stainless Steel Heat Exchanger

Direct Vent

95% Efficiency

Combi Boiler
Retail : $4,863.00 $2,482.08

You Save (49%)
Green Mountain ECR114703800104 GMCB 150 Input MBtu - 95% AFUE Combination Heat & Domestic Natural Gas Hot Water Boiler - Direct Vent
4201.002144.19
150 MBtu
GMCB-150
In Stock

Green Mountain ECR120003800104 GMCB 200 Input MBtu - 95% AFUE Combination Heat & Domestic Natural Gas Hot Water Boiler - Direct Vent
4863.002482.08
200 MBtu
GMCB-200
In Stock
Qty:
Green Mountain GMOW Series I

Oil-Fired, Water

Cast Iron Heat Exchanger

Chimney Vent

86% Efficiency

Without Burner

With Coil
Retail : $4,162.00 $2,380.66

You Save (43%)
Green Mountain GMA308522210504 GMOWT 119 Input MBtu - 86% AFUE Oil-Fired Hot Water Boiler - with Tankless Coil - Chimney Vent (Burner Sold Separately)
3904.002233.09
119 MBtu
GMOW-3T
In Stock

Green Mountain GMA412522210504 GMOWT 175 Input MBtu - 86% AFUE Oil-Fired Hot Water Boiler - with Tankless Coil - Chimney Vent (Burner Sold Separately)
4162.002380.66
175 MBtu
GMOW-4T
In Stock

Green Mountain GMA516022210504 GMOWT 224 Input MBtu - 86% AFUE Oil-Fired Hot Water Boiler - with Tankless Coil - Chimney Vent (Burner Sold Separately)
5102.002918.34
224 MBtu
GMOW-5T
In Stock

Green Mountain GMA618522210504 GMOWT 259 Input MBtu - 86% AFUE Oil-Fired Hot Water Boiler - with Tankless Coil - Chimney Vent (Burner Sold Separately)
5796.003315.31
259 MBtu
GMOW-6T
In Stock
Qty:
Green Mountain GMHB Series

Gas, Water

Stainless Steel Heat Exchanger

Direct Vent

95% Efficiency

Heat Only
Retail : $3,904.00 $1,992.60

You Save (49%)
Green Mountain ECR112203800104 GMHB 125 Input MBtu - 95% AFUE Heating Model Condensing Natural Gas Hot Water Boiler - Direct Vent
3904.001992.60
125 MBtu
GMHB-125
In Stock

Green Mountain ECR116003800104 GMHB 160 Input MBtu - 95% AFUE Heating Model Condensing Natural Gas Hot Water Boiler - Direct Vent
4643.002369.79
160 MBtu
GMHB-160
In Stock

Green Mountain ECR122703800104 GMHB 227 Input MBtu - 95% AFUE Heating Model Condensing Natural Gas Hot Water Boiler - Direct Vent
9120.004654.85
227 MBtu
GMHB-227
In Stock

Green Mountain ECR138003800104 GMHB Series 379 MBtu 95% AFUE Heating Model Condensing Natural Gas Hot Water Boiler - Direct Vent
13457.006868.45
379 MBtu
ECR138003800104
Qty:
Laars Mascot Ft Series Combi Boilers

Gas, Water

Stainless Steel Heat Exchanger

Direct Vent

95% Efficiency

Heat Only
Retail : $4,802.00 $2,372.19

You Save (51%)
Laars MFTHW080NA1XN MFTHW-80 Mascot Ft High Efficiency Residential 80,000 BTU 95% AFUE Natural Gas/Liquid Propane Wall Mount Condensing Heat Only Boiler
2668.361867.85
80 MBtu
MFTHW-80

Laars MFTHW140NA2XN Mascot Ft 140 Input MBtu - 95% AFUE Residential Natural Gas/Liquid Propane Wall Mount Condensing Heating Model Boiler - Direct Vent
4802.002372.19
140 MBtu
MFTHW-140
In Stock

Laars MFTHW199NA2XN Mascot Ft 199 Input MBtu - 95% AFUE Residential Natural Gas/Liquid Propane Wall Mount Condensing Heating Model Boiler - Direct Vent
5143.002540.64
199 MBtu
MFTHW-199
In Stock
Qty:
Laars Mini Therm JX Series Gas-Fired Boilers

Gas, Water

Cast Iron Heat Exchanger

84% Efficiency

With Pump
Retail : $4,471.00 $2,414.34

You Save (46%)
Laars JX125NLXU1 M/Therm 125 Input MBtu - 84% AFUE Hydronic & Pump Assembly Low Loss Header Ft Natural Gas-Fired Boiler - Altitude 0-2000
4471.002414.34
125 MBtu
JX125NLXU1
In Stock

Laars JX150NLXU1 M/Therm 150 Input MBtu - 84% AFUE Hydronic & Pump Assembly Low Loss Header Ft Natural Gas-Fired Boiler - Altitude 0-2000
4762.002571.48
150 MBtu
JX150NLXU1
In Stock

Laars JX200NLXU1 M/Therm 199 Input MBtu - 97% AFUE Hydronic & Pump Assembly Low Loss Header Ft Natural Gas-Fired Boiler - Altitude 0-2000
5760.003110.40
199 MBtu
JX200NLXU1
Qty:
Green Mountain GMGW-D

Gas, Water

Cast Iron Heat Exchanger

Chimney Vent

84% Efficiency
Retail : $5,591.00 $3,444.06

You Save (38%)
Green Mountain 15C826203210304 GMGW-D 262 Input MBtu 84% AFUE Natural Gas Hot Water Boiler - Chimney or Sidewall Vent
5591.003444.06
262 MBtu
GMGW-8D
In Stock

Green Mountain 15C929903210304 GMGW-D 299 Input MBtu 84% AFUE Natural Gas Hot Water Boiler - Chimney or Sidewall Vent
5907.003638.71
299 MBtu
GMGW-9D
In Stock
Qty:
Green Mountain GMOW Series

Oil-Fired, Water

Cast Iron Heat Exchanger

Chimney Vent

86% Efficiency

Without Burner
Retail : $4,759.00 $2,722.15

You Save (43%)
Green Mountain GMA308520210504 GMOW 119 Input MBtu - 86% AFUE Oil-Fired Hot Water Boiler - Chimney Vent (Burner Sold Separately)
3479.001989.99
119 MBtu
GMOW-3
In Stock

Green Mountain GMA412520210504 GMOW 175 Input MBtu - 86% AFUE Oil-Fired Hot Water Boiler - Chimney Vent (Burner Sold Separately)
3805.002176.46
175 MBtu
GMOW-4
In Stock

Green Mountain GMA516020210504 GMOW 224 Input MBtu - 86% AFUE Oil-Fired Hot Water Boiler - Chimney Vent (Burner Sold Separately)
4759.002722.15
224 MBtu
GMOW-5
In Stock

Green Mountain GMA618520210504 GMOW 259 Input MBtu - 86% AFUE Oil-Fired Hot Water Boiler - Chimney Vent (Burner Sold Separately)
5448.003116.26
259 MBtu
GMOW-6
In Stock
Qty:
Green Mountain GMGS Series

Gas, Steam

Cast Iron Heat Exchanger

Chimney Vent

82.00% Efficiency
Retail : $5,068.00 $3,263.79

You Save (36%)
Green Mountain 16B307503100204 GMGS 75 Input MBtu - 82% AFUE Natural Gas Steam Boiler - Chimney Vent
3549.002285.56
75 MBtu
GMGS 75
In Stock

Green Mountain 16B411203100204 GMGS 112 Input MBtu - 82% AFUE Natural Gas Steam Boiler - Chimney Vent
3969.002556.04
112 MBtu
GMGS 112
In Stock

Green Mountain 16B515003100204 GMGS 150 Input MBtu - 82% AFUE Natural Gas Steam Boiler - Chimney Vent
4434.002855.50
150 MBtu
GMGS 150
In Stock

Green Mountain 16B618703100204 GMGS 187 Input MBtu - 82% AFUE Natural Gas Steam Boiler - Chimney Vent
5068.003263.79
187 MBtu
GMGS 187
In Stock

Green Mountain 16B722503100204 GMGS 225 Input MBtu - 82% AFUE Natural Gas Steam Boiler - Chimney Vent
5661.003645.68
225 MBtu
GMGS 225
In Stock

Green Mountain 16B826203100204 GMGS 262 Input MBtu - 82% AFUE Natural Gas Steam Boiler - Chimney Vent
6254.004027.58
262 MBtu
GMGS 262
In Stock

Green Mountain 16B929903100204 GMGS 299 Input MBtu - 82% AFUE Natural Gas Steam Boiler - Chimney Vent
6661.004289.68
299 MBtu
GMGS 299
In Stock
Qty:
Green Mountain GMGW Series Boilers

Gas, Water

Cast Iron Heat Exchanger

Vertical Vent

82% Efficiency

With Pump
Retail : $3,338.00 $2,056.21

You Save (38%)
Green Mountain 15B306003710304 GMGW-K 59 Input MBtu - 84% AFUE Natural Gas-Fired Water Boiler - Vertical Vent
2838.001748.21
59 MBtu
GMGW-060K
In Stock

Green Mountain 15B409503710304 GMGW-K 92 Input MBtu - 84% AFUE Natural Gas-Fired Water Boiler - Vertical Vent
3108.001914.53
92 MBtu
GMGW-095K
In Stock

Green Mountain 15B512003710304 GMGW-K 120 Input MBtu - 84% AFUE Natural Gas-Fired Water Boiler-Vertical Vent
3338.002056.21
120 MBtu
GMGW-120K
In Stock

Green Mountain 15B615003710304 GMGW-K 149 Input MBtu - 84% AFUE Natural Gas-Fired Water Boiler - Vertical Vent
3728.002296.45
149 MBtu
GMGW-150K
In Stock

Green Mountain 15B717503710304 GMGW-K 175 Input MBtu - 84% AFUE Natural Gas-Fired Water Boiler-Vertical Vent
4104.002528.06
175 MBtu
GMGW-175K
In Stock

Green Mountain 15B820503710304 GMGW-K 205 Input MBtu - 84% AFUE Natural Gas-Fired Water Boiler - Vertical Vent
4612.002840.99
205 MBtu
GMGW-205K
In Stock

Green Mountain 15B923503710304 GMGW-K 235 Input MBtu - 84% AFUE Natural Gas-Fired Water Boiler - Vertical Vent
5020.003092.32
235 MBtu
GMGW-235K
In Stock
Qty:
Green Mountain GMPVB Series

Gas, Water

Cast Iron Heat Exchanger

Chimney Vent

84.00% Efficiency
Retail : $3,415.00 $2,270.97

You Save (34%)
Green Mountain FSB204203110204 GMPVB 42 Input MBtu - 84% AFUE Natural Gas Hot Water Boiler - Chimney / Side Wall Vented
3025.002011.62
42 MBtu
GMPVB-42

Green Mountain FSB307503110304 GMPVB 75 Input MBtu - 84% AFUE Natural Gas Hot Water Boiler - Chimney or Sidewall vent
3415.002270.97
75 MBtu
GMPVB-75

Green Mountain FSB411203110204 GMPVB 112 Input MBtu - 84% AFUE Natural Gas Hot Water Boiler - Chimney or Sidewall vent
3764.002503.06
112 MBtu
GMPVB-112
In Stock

Green Mountain FSB515003110304 GMPVB 150 Input MBtu - 84% AFUE Natural Gas Hot Water Boiler - Chimney or Sidewall vent
4215.002802.97
150 MBtu
GMPVB-150
In Stock

Green Mountain FSB618703110304 GMPVB 187 Input MBtu - 84% AFUE Natural Gas Hot Water Boiler - Chimney or Sidewall vent
4933.003280.44
187 MBtu
GMPVB-187
In Stock

Green Mountain FSB722503110204 GMPVB 225 Input MBtu - 84% AFUE Natural Gas Hot Water Boiler - Chimney or Sidewall vent
3756.302629.41
225 MBtu
GMPVB-225
Qty:
Laars Neotherm XTR Series Hydronic Boilers

Natural Gas

Direct Vent

96.40% Efficiency

10 Years Warranty
Retail : $38,197.00 $24,064.11

You Save (37%)
Laars NT2H0500NJNX1 Neotherm XTR 500 Input MBtu 96.6 % AFUE - Commercial Natural Gas Hydronic Boiler with Pump
30023.0018914.49
500 MBtu
NT2H0500NJNX1
In Stock

Laars NT2H0650NJNX1 Neotherm XTR 650 Input MBtu 96.5% AFUE - Commercial Natural Gas Hydronic Boiler with Pump
33660.0021205.80
650 MBtu
NT2H0650NJNX1
In Stock

Laars NT2H0800NJNX1 Neotherm XTR 800 Input MBtu 96.4% AFUE - Commercial Natural Gas Hydronic Boiler with Pump
38197.0024064.11
800 MBtu
In Stock
Qty:
Laars Mighty Therm2 Series Water Heater

Natural Gas

85% Efficiency
Retail : $26,967.00 $20,225.25

You Save (25%)
Laars MT2V-1000 Mighty Therm2 999 Input MBtu 85% AFUE Volume Water Heater
24233.5618175.17
1000 MBtu
MT2V-1000
Qty:
Laars Mini-Therm JX Series Hydronic Boiler

Natural Gas

84% Efficiency
Retail : $4,295.00 $2,319.30

You Save (46%)
Laars JX100NXXU1 Mini-Therm 100 Input MBtu 84% AFUE Gas-Fired Hydronic Boiler (0-2,000 FT)
4295.002319.30
100 MBtu
JX100NXXU1
In Stock
Qty:
Laars Pennant Series water Boiler

Gas, Water

85% Efficiency
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
23404.0017553.00
500 MBtu
PNCH-500
In Stock

Laars PNCH-750 Pennant 750 Input MBtu - 85% AFUE Commercial Natural Gas/Liquid Propane Water Boiler - Direct Vent
25431.0019073.25
750 MBtu
PNCH-750
In Stock

Laars PNCH-1000 Pennant 999 Input MBtu - 85% AFUE Commercial Natural Gas/Liquid Propane Water Boiler - Direct Vent
31585.0023688.75
999 MBtu
PNCH-1000
In Stock

Laars PNCH-1250 Pennant 1250 Input MBtu - 85% AFUE Commercial Natural Gas/Liquid Propane Water Boiler - Direct Vent
35719.0026789.25
1250 MBtu
PNCH-1250

Laars PNCH-1500 Pennant™1500 input MBtu 85% AFUE Hydronic Water Boiler
40254.0030190.50
1500 MBtu
PNCH-1500
In Stock

Laars PNCH-1750 Pennant 1,750 Input MBtu - 85% AFUE Commercial Natural Gas/Liquid Propane Water Boiler - Direct Vent
44411.0033308.25
1750 MBtu
PNCH-1750
In Stock

Laars PNCH-2000 Pennant 1,999 Input MBtu - 85% AFUE Commercial Natural Gas/Liquid Propane Water Boiler - Direct Vent
48625.0036468.75
1999 MBtu
PNCH-2000
In Stock
Qty:
Laars Mighty Therm2 Series Hydronic Boilers

Natural Gas

85% Efficiency
Retail : $35,146.00 $26,359.50

You Save (25%)
Laars MT2H-500 Mighty Therm2 MT2H0500NACK1CJN Commercial 500,000 BTU 85% AFUE Natural Gas Water Boiler with Pump
20404.0015303.00
500 MBtu
MT2H-500
In Stock

Laars MT2H-750 Mighty Therm2 MT2H0750NACK1CJN Commercial 750,000 BTU 85% AFUE Natural Gas Water Boiler with Pump
22847.0017135.25
750 MBtu
MT2H-750
In Stock

Laars MT2H-1250 Mighty Therm2 MT2H1250NACK1CJN Commercial 1,250,000 BTU 85% AFUE Natural Gas Water Boiler with Pump
30229.0022671.75
1250 MBtu
MT2H-1250

Laars MT2H-1500 Mighty Therm2 1,500 Input MBtu 85% AFUE Hydronic Boiler
35146.0026359.50
1500 MBtu
MT2H-1500
In Stock
Qty:
Laars FT Series Boiler - Heat Only

Natural Gas/Liquid Propane

95% Efficiency
Retail : $6,737.00 $3,840.09

You Save (43%)
Laars LFTHF199NA1XN FT Series 199 Input MBtu 95% AFUE High Efficiency Residential Natural Gas/Liquid Propane Floor Standing Heat Only Fire Tube Boiler - Direct Vent
6737.003840.09
199 MBtu
LFTHF199NA1XN
In Stock
Qty:
Lochinvar WHB

Gas, Water

Stainless Steel Heat Exchanger

95.30% Efficiency

Combi Boiler
Retail : $7,309.00 $4,166.13

You Save (43%)
Laars LFTCF199NA1XN Floor Mount Combi Fire Tube Boiler 199 Input MBH 95% AFUE
7309.004166.13
199 MBtu
LFTCF199NA1XN
In Stock
Qty:

Now Shopping by

Manufacturer Green Mountain Remove This Item
Manufacturer Laars Remove This Item

Clear All

Shopping Options

By using this site you agree to our © 2025 AF Supply Corp. All Rights Reserved.