Boilers

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Boilers warm a home by using a fuel source to heat water, which is then distributed as liquid or steam through a piping system. The benefits of boilers include evenly-distributed heat, quiet operation, and no airborne particles. Armed with our buyer's guide, expert support and customer reviews, you can feel confident in finding the right boiler for your needs.

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Net I=B=R Capacity (BTU)

I=B=R, also referred to as Net Output or AHRI Capacity, is the rated heat output of a boiler after accounting for combustion efficiency, piping loss, and an extra pickup factor. We recommend sizing steam boilers based on the I=B=R rating.

73 - 80072 (172)

80073 - 160072 (306)

160073 - 240072 (119)

240073 - 320072 (23)

320073 - 400072 (8)

400073 - 480072 (5)

480073 - 560072 (3)

560073 - 640072 (3)

640073 - 720072 (3)

720073 - 800072 (3)

800073 - 880072 (5)

880073 - 960072 (4)

960073 - 1040072 (2)

1040073 - 1120072 (1)

1120073 - 1200072 (2)

1200073 - 1280072 (4)

1280073 - 1360072 (2)

1360073 - 1440072 (2)

1440073 - 1520072 (2)

1520073 - 1600072 (2)

1600073 - 1680072 (5)

1680073 - 1760072 (2)

1760073 - 1840072 (2)

1920073 - 2000072 (1)

2000073 - 2080072 (1)

2080073 - 2160072 (1)

2480073+ (1)

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DOE Heating Capacity (BTU)

Also referred to as Gross Output, this is the output of a boiler after accounting for combustion efficiency. We recommend sizing hot water boilers based on the DOE Heating Capacity.

84 - 40083 (13)

40084 - 80083 (95)

80084 - 120083 (170)

120084 - 160083 (116)

160084 - 200083 (99)

200084 - 240083 (71)

240084 - 280083 (30)

280084 - 320083 (17)

320084 - 360083 (5)

360084 - 400083 (9)

400084 - 440083 (2)

440084 - 480083 (1)

480084 - 520083 (2)

520084 - 560083 (2)

560084 - 600083 (1)

600084 - 640083 (2)

680084 - 720083 (1)

720084 - 760083 (4)

840084 - 880083 (2)

880084 - 920083 (1)

920084 - 960083 (4)

960084 - 1000083 (1)

1040084 - 1080083 (2)

1080084 - 1120083 (2)

1120084 - 1160083 (2)

1240084 - 1280083 (2)

1360084 - 1400083 (2)

1400084 - 1440083 (2)

1440084 - 1480083 (3)

1560084 - 1600083 (2)

1680084 - 1720083 (2)

1760084 - 1800083 (2)

1880084 - 1920083 (4)

1920084 - 1960083 (1)

2000084 - 2040083 (2)

2080084 - 2120083 (2)

2200084 - 2240083 (2)

2280084 - 2320083 (2)

2400084 - 2440083 (1)

2840084+ (1)

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Maximum Input Capacity (BTU)

The Maximum Input Capacity describes how quickly the appliance will use fuel when delivering it's maximum capacity. The units may change depending on the fuel being used.

30000 - 129999 (196)

130000 - 229999 (215)

230000 - 329999 (86)

330000 - 429999 (22)

430000 - 529999 (8)

530000 - 629999 (2)

630000 - 729999 (3)

730000 - 829999 (4)

830000 - 929999 (3)

930000 - 1029999 (3)

1030000 - 1129999 (3)

1130000 - 1229999 (3)

1230000 - 1329999 (3)

1430000 - 1529999 (5)

1530000 - 1629999 (2)

1630000 - 1729999 (2)

1730000 - 1829999 (2)

1930000 - 2029999 (5)

2030000 - 2129999 (2)

2130000 - 2229999 (2)

2330000 - 2429999 (2)

2430000 - 2529999 (3)

2530000 - 2629999 (2)

2730000 - 2829999 (2)

2830000 - 2929999 (2)

2930000+ (1)

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AFUE (%)

AFUE (Annual Fuel Utilization Efficiency) measures the efficiency of combustion equipment over the entire heating season, and is calculated by dividing the amount of energy that is actually heating your home by the total energy contained in the fuel used by the boiler/furnace. Learn More

81 - 82 (136)

83 - 84 (272)

85 - 86 (94)

87 - 88 (16)

91 - 92 (10)

93 - 94 (24)

95 - 96 (101)

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Efficiency (%)

77 - 78 (3)

81 - 82 (3)

93 - 94 (1)

95 - 96 (7)

97 - 98 (1)

Vent Type

Products that use combustion (burning) of fuel to create heat also create potentially dangerous gasses that need to be exhausted (AKA "Vented"). Depending on the product, venting can be done via a chimney, through a side wall, or use a second vent to provide fresh air to the appliance.

Chimney or Direct Vent (3)

Chimney Vent (445)

Direct Vent (154)

Power Vent (88)

Modulating/Staging

Stages are unique speeds or levels that equipment can operate at. More stages allow for better fine-tuned control of output, which improves comfort and efficiency. Modulating equipment can operate across a range of levels, giving the highest level of fine-tuned control. Learn More

Eight Stage (6)

Eleven Stage (4)

Fifteen Stage (1)

Five Stage (4)

Four Stage (4)

Fourteen Stage (1)

Modulating (157)

Nine Stage (8)

Seven Stage (4)

Single Stage (548)

Six Stage (6)

Staging (10)

Ten Stage (4)

Thirteen Stage (1)

Three Stage (3)

Twelve Stage (4)

Two Stage (4)

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Fuel Type

To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.

Electric (81)

Liquid Propane (136)

Natural Gas (441)

Oil (107)

Oil/Natural Gas (6)

DHW Production

DHW (Domestic Hot Water) is potable water for uses other than space heat. Some boilers are able to provide DHW "out of the box", while others can do so with the purchase of optional accessories.

Available (116)

No (564)

Yes (91)

Brand

Weil-McLain (272)

Crown Boiler Co. (196)

Noritz (5)

Burnham (139)

Electro Industries (81)

Triangle Tube (19)

Buderus (33)

Rinnai (8)

Bosch Thermotechnology (8)

Peerless (7)

Williamson-Thermoflo (6)

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Learn More About Bosch Thermotechnology ZBR16-3

Bosch Greenstar 57 - 51K BTU - 95.0% AFUE - Hot Water Gas Boiler - Direct Vent

Model: ZBR16-3

Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 57K BTU Gross Input, 51K BTU DOE Capacity, 45K BTU Net IBR Capacity. Includes Circulator.

(3)

Q&A (3)

$2,399.00

Factory-Direct

Free Shipping & Lift Gate

*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.

2% Check Discount

Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.