Skip to Main Content
Skip to Search Filters
Skip to Footer
Deliver to
Change Location
Results loading, please wait
|
Help
My Account
Loading...
Cancel
View All
Back
My Account
Deliver to
Essential Business Update: Delivery and call times may be impacted. Get order status & support now.
Essential Business Delays: Get order status & support now.
Home
/
Gas Boilers
/
Boilers
/
Heating
/
85-90% Efficiency Gas Boilers
85-90% Efficiency Gas Boilers
Quick Search
Select Product Type
Boilers - Hot Water
Boilers - Steam
Central Air Conditioners
Central Air Packages
Central Heat Pumps
Dehumidifiers
Electric Radiant Floor Heating
Energy Recovery Ventilators
Fans
Gas Furnaces
Heat Recovery Ventilators
Humidifiers
Mini Split Systems (Ductless)
PTAC Units
Radiators
Shower Systems
Thermostats
Unit Heaters
Water Heaters
Standby Generators
Select Product Type
Filter
▼
Best Selling
▼
Best Selling
Price: Low to High
Price: High to Low
Name: A-Z
Name: Z-A
Recommends Only
Closeouts Only
In-stock Only
Next Day Air Only
Availability
Go
Filters
Brand
Burnham (5)
DOE Heating Capacity (BTU)
×
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.
To
50000 - 59999 (1)
70000 - 79999 (1)
100000 - 109999 (1)
130000 - 139999 (1)
150000 - 159999 (1)
Net I=B=R Capacity (BTU)
×
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.
To
40000 - 49999 (1)
60000 - 69999 (1)
90000 - 99999 (1)
110000 - 119999 (1)
130000 - 139999 (1)
Maximum Input Capacity (BTU)
×
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.
60000 - 69999 (1)
90000 - 99999 (1)
120000 - 129999 (1)
150000 - 159999 (1)
180000 - 189999 (1)
DHW Production
×
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.
No (5)
AFUE (%)
×
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
85 (5)
Vent Type
×
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.
Direct Vent (5)
Fuel Type
×
Fuel Type
To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.
Natural Gas (5)
Modulating/Staging
×
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
Single Stage (5)
Ultra Low NOx Emissions
×
Ultra Low NOx Emissions
NOx is a byproduct of the combustion process, and it's output is regulated in some jurisdictions. Many regulators mirror SCAQMD rules, which regulate air quality for some parts of Southern California. Ultra Low NOx appliances emit less than 10-14 ng/J (nanogram per Joule) of NOx.
Learn More
No (5)
Compare
Burnham ESC4C - 78K BTU - 85.2% AFUE - Hot Water Gas Boiler - Direct Vent
Model: ESC4CNI-TS
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 91K BTU Gross Input, 90K BTU DOE Capacity, 68K BTU Net IBR Capacity. Includes Circulator.
100% Buy This
Write a Review
$2,459.00
Factory-Direct
Free Shipping & Lift Gate
×
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
×
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.
Add To Cart
Compare
Burnham ESC3C - 52K BTU - 85.2% AFUE - Hot Water Gas Boiler - Direct Vent
Model: ESC3CNI-TS
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 61K BTU Gross Input, 60K BTU DOE Capacity, 45K BTU Net IBR Capacity. Includes Circulator.
Write a Review
$2,377.00
Factory-Direct
Free Shipping & Lift Gate
×
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
×
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.
Add To Cart
Compare
Burnham ESC5C - 104K BTU - 85.2% AFUE - Hot Water Gas Boiler - Direct Vent
Model: ESC5CNI-TS
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 122K BTU Gross Input, 120K BTU DOE Capacity, 90K BTU Net IBR Capacity. Includes Circulator.
Write a Review
$2,805.00
Factory-Direct
Free Shipping & Lift Gate
×
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
×
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.
Add To Cart
Compare
Burnham ESC6C - 130K BTU - 85.2% AFUE - Hot Water Gas Boiler - Direct Vent
Model: ESC6CNI-TS
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 152K BTU Gross Input, 150K BTU DOE Capacity, 113K BTU Net IBR Capacity. Includes Circulator.
Write a Review
$3,170.00
Factory-Direct
Free Shipping & Lift Gate
×
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
×
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.
Add To Cart
Compare
Burnham ESC7C - 156K BTU - 85.3% AFUE - Hot Water Gas Boiler - Direct Vent
Model: ESC7CNI-TS
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 182K BTU Gross Input, 179K BTU DOE Capacity, 136K BTU Net IBR Capacity. Includes Circulator.
Write a Review
$3,513.00
Factory-Direct
Free Shipping & Lift Gate
×
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
×
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.
Add To Cart
PREVIOUS
PREV
1
NEXT
Displaying Products 1 - 5 (of 5
)
Hide
Compare
Clear All
