Gas Fired, High Efficiency, Sealed Combustion or Power VentedCast Iron Water Boiler

• DirectVent(horizontalorvertical) orPowerVent

• EfficientOperationSaves HomeownersMoney!

• InnovativeDesignandAppearance

• IdealReplacementforMillionsof ExistingBoilerInstallations

• 7sizes,70-280MBHinput

• 5or10-yearParts&LaborExtended WarrantyPlansAvailable

85.5% AFUE

Limited Lifetime Warranty!

• FeaturesIQControlSystem™

• TruePlug&PlayControlsUtilizing IQOptionCards; –OutdoorReset (with Domestic Hot Water Priority) –AuxiliaryHighLimit(manual or auto) –LowWaterCut-off(manual or auto) – OptionalLCDTouchScreenDisplay

• ImprovedBoiler&HeatingSystem Operation

IQboilercontrol

IQoptionpanel

IQoptioncard

IQcontrolsystem

GREATER ENERGY SAVINGS

ESC Boiler

by

TM

UpTo

The Perfect Balance…How can a heating boiler be revolutionary, yet practical at the same time? U.S. Boiler Company has the solution to this question. Introducing the ESC boiler… a modern, versatile space-heating boiler designed to maximize the comfort and efficiency of nearly any heating system. Born from the award-winning technology and innovation found in U.S. Boiler Company’s chimney-vented models, The ESC delivers the perfect balance of energy-saving performance, durability, & installer-friendly features, for homes and buildings where a chimney-vented boiler is not an option. The ESC boiler can be installed in power vent or direct vent applications, with sidewall or vertical vent terminals for added flexibility.

TheESCstrikesanidealbalancebycombiningthebestfeaturesofmoderncondensingboilers,withthetriedandtruedurabilityofcastironboilers.Until now, selecting the right boiler often required choosing between high efficiency stainless steel and aluminum condensing boilers, or simpler cast iron boilers. Condensing boilers often provide advanced controls, and can operate at lower temperatures, optimizing comfort and heating system efficiency. Traditionally, cast iron boilers offered the longest life, and lower maintenance costs, but had limited control options and low temperature capability. Choosing one meant sacrificing the benefits of the other…until now. Today, the ESC boiler is uniquely capable of offering the best of both of both worlds!

Comfort & Energy SavingsThe sleek, contoured jacket design raises the bar for cast iron boilers; it’s also a preview of the advanced technology inside. The ESC’s rugged, proven G3 cast iron heat exchanger provides efficiencies of up to 85.5%, and delivers long-lasting performance – even in low temperature ranges where most ordinary cast iron boilers cannot operate. The G3 heat exchanger is constructed of BC25-HSi high silicon cast iron to ensure the highest quality, and exceptional performance. Designed for optimum heat transfer, the G3 cast iron heat exchanger resists thermal shock, and operates condensate-free at return water temperatures as low as 110°F – far lower than the 140°F rating of most cast iron competitors. Since lower water temperatures generally improve heating system comfort and fuel efficiency, the ESC can provide comfort and energy savings other cast iron boilers simply can’t match!

Performance Without Compromise

ESCTM

Peace of MindIn addition, the cast iron heat exchanger in every ESC boiler is manufactured domestically using some of the most advanced foundry equipment and techniques available in the industry. Still concerned about peace of mind and longevity? We’ve REALLY got you covered! Each ESC boiler is backed by a LIMITED LIFETIME WARRANTY on the heat exchanger. Additional coverage is available by purchasing the Boiler Extended Warranty Plan, which provides blanket protection on parts and labor for 5 or 10 years from the date of installation

Unmatched ControlsAnother feature that truly sets the ESC apart from ordinary cast iron boilers is the IQ Boiler Control System. The IQ Control was designed to integrate the boiler and the heating system – allowing the two to work in concert. The IQ Control can actually help most heating systems to operate with improved efficiency, and greater comfort.

The IQ Boiler Control System provides operating controls and constantly monitors the ESC boiler to help maximize operating efficiencies. An installer-friendly 3-digit LED read-out saves time by providing simple access to the status, settings, and diagnostics of the highly capable IQ Control System.

The ESC boiler represents U.S. Boiler Company’s ongoing commitment to provide homeowners with home heating equipment engineered and manufactured with uncompromising safety, reliability, and durability. By incorporating features such as the IQ Boiler Control System, U.S. Boiler company is able to integrate high capability with real world practicality in a package which is made in Lancaster, Pennsylvania, USA.

Made in America

HOM

E HEATING

by Co rne rS tone Un i t ed

W A R R A N T I E SEXTENDED

Convenient Junction Box With plenty of room for 120V connections

Supply & Return Tappings Match locations for industry-standard installations. Makes replacing and older boiler easy!

Attractive, Modern, Insulated, Powder Coated Steel JacketTough powder coated steel jacket designed for durability and great appearance. Jacket is lined with thick insulation, and has an additional layer of insulation at the base of the boiler.

Optional Touch Screen DisplayOptional LCD touchscreen display with full text (not code) two-color display of all boiler and option card status, settings, and diagnostics

Allow for easy positioning of the boiler, and protect against potential damage to flooring

Trapezoidal Legs with Nylon Glides

The ESC is protected with a limited lifetime warranty on the heat exchanger. Additional coverage is available by purchasing the U.S. Boiler Extended Warranty Plan which provides blanket protection on parts and labor for 5 or 10 years from the date of installation.

Limited Lifetime Warranty & Extended Warranty

Alliance SL™Indirect-firedWaterHeatersFor an abundant supply of domestic hot water, be sure to use an Alliance SL indirect-fired water heater with every boiler application. Alliance SL water heaters are designed with an effective hydrastone lining that offers superior corrosion resistance and outstanding performance in a wide variety of water conditions. Water heaters are available in five sizes and come with a unique 10/2/1 warranty – 10 years on the tank and coil, 2 years labor and 1 year on parts. An optional lifetime warranty is also available.

ESC…The Inside Story

HOM

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W A R R A N T I E SEXTENDED

Flat Rear PanelRear jacket panel is flat with no protrusions – simplifies boiler transport and enables boiler to be mounted flush with wall.

Proven G3 Heat Exchanger

Made of specially formulated BC25-HSi high silicon grey iron, this heat exchanger has been precision formed to create turbulent water flow throughout all areas of the heat exchanger, eliminating hot and cold spots, and maximizing heat transfer.

G3 BaseFeaturing heavy gauge steel construction, this base provides unmatched stability and safety through its wrap-around design. The design also provides a tighter seal with fewer joints. Thick insulating plates direct the heat from the burner tubes upward into the heat exchanger, helping to fully utilize every BTU possible from the combustion process.

Step Opening Gas ValveThis type of gas valve enables the boiler to light on low fire. Once a flame is established, the valve gently opens to full fire safely and smoothly. This provides quiet ignition and promotes long boiler life.

IQ Boiler ControlIntegrates aquastat, relay, and ignition functions into a single module. Controls are concealed inside jacket, but are mounted on hinged panel for ease of access for servicing. An LED digital read-out displays settings, status, and diagnostic information.

IQ Option Panel ADD 15-20% ENERGY SAVINGS!Accepts optional IQ Option Cards for simple “plug & play” installation of:– Outdoor Resetoffers 15-20% energy savings PLUS domestic hot water priority, and reduced cycling– Low Water Cutoff (manual* or auto reset)– High Temperature Limit (manual* or auto reset)

IQboilercontrol

IQoptionpanel

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Cast iron, proven for long life

* Manual reset is CSD-1 compliant in US and Canada

Direct VentHorizontal and vertical vent options. Can be configured for power vent operation using room air for combustion

Proven G3 Heat Exchanger

Made of specially formulated BC25-HSi high silicon grey iron, this heat exchanger has been precision formed to create turbulent water flow throughout all areas of the heat exchanger, eliminating hot and cold spots, and maximizing heat transfer.

Controls, Like No Other...If the G3 heat exchanger is the brawn of the ESC Boiler, the IQ Boiler Control System is the brains. The IQ Control System has been specifically designed for the next generation of high efficiency cast iron boilers. It simplifies boiler operating controls by combining all the typical boiler safety controls, including ignition, into one central control module. LED readouts clearly communicate system status updates, and the end result is a control system which is simpletoread,simpletosetup,andsimpletodiagnose.

The IQ Option Panel resides below the boiler control. The Option Panel permits the addition of features to the boiler by way of genuine IQ Option Cards. These option cards allow the “plug-n-play” installation of such features as Outdoor Reset, Low Water Cutoff, and an auxiliary Aquastat. Thanks to the unique design of the IQ Option Panel, installation of these boiler control upgrades are extremely easy for the qualified technician to perform.

IQ Outdoor Reset Card – for Increased Energy SavingsA weather-sensitive control that adjusts the boiler temperature up or down based on the outdoor air temperature. It’s a simple concept. On cooler days, a home requires more heat to remain at a comfortable temperature inside. On these days, the boiler temperature is automatically adjusted upward. By contrast, on warmer days, a home requires less heat to maintain comfort, so the boiler temperature is adjusted down. Adjusting the boiler temperature has several advantages. Often it allows the boiler to operate at a lower temperatures , which enhancesefficiencyandcandeliversavingsof15-20%. It maximizes the comfort of the heating system by allowing the boiler to run for longer cycles at a steady temperature, minimizing wasteful on/off cycling. Adding the benefits of outdoor reset to the ESC boiler is as simple as plugging the Option Card into the IQ Option Panel and connecting a 2-wire sensor. Additionally, the IQ Outdoor Reset Option Card contains many powerful features normally found only on large stand-alone control packages, such as:

• Selectable Domestic Hot Water Priority

• Selectable & Adjustable Domestic Priority Protection

• Adjustable Domestic Setpoint

• Selectable and Adjustable Temperature Boost

All settings on the IQ Outdoor Reset Option Card can be customized for ideal performance in any heating system.

Takes REAL ADVANTAGE of outdoor reset control!Because of the ESC’s exceptional G3 heat exchanger, the ESC boiler can safely handle return water temperatures as low as 110°F which significantly increases the system efficiency of most heating systems. Even higher system efficiencies can be achieved by adding the IQ Outdoor Reset Card to the IQ Boiler Control System in an ESC, resulting in more fuel savings and improved comfort.

IQboilercontrol

IQoptionpanel

IQoptioncard

IQcontrolsystem Helps Improve Efficiency,

Saving Energy and Money!

Chart Tit le

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100°F 110°F 120°F 130°F 140°F 150°F 160°F 170°F 180°F

Heating System Efficiency in Relationship toSystem Return Water Temperature

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75

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85

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100°F 110°F 120°F 130°F 140°F 150°F 160°F 170°F 180°F

Heating System Return Water Temperature

Heat

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ESCOutdoor Reset

Typical Cast Iron Boilers require a MINIMUM return w ater temperature of 140°F to prevent f lue gas condensation and heat exchanger damage. This limits heating system eff iciency.

Increased system efficiency only available with ESC where return water temperatures can be as low as 110°F.

Typical Cast Iron Boilers

System Efficiency

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R esetOutdo o r

This is the only boiler that takes real advantage of outdoor reset control. Because of the ES2’s exceptional G3 heat exchanger, the ES2 boiler can safely handle return water temperatures as low as 110°F, which significantly increases the system efficiency of most heating systems. Even higher system efficiencies can be achieved by adding the IQ Outdoor Reset Card to the IQ Boiler Control System in an ES2, resulting in more fuel savings and improved comfort.

LCD Touch Screen DisplayThe IQ Touch Screen Display Kit offers the option of adding a state-of-the-art 3.5” multi-color LCD touch screen display to the ESC boiler. The display mounts in a special knock-out in the plastic hood above the front door of the ESC boiler and communicates with the IQ Boiler Control and IQ Option Cards. All boiler settings, status and errors are displayed in full text on the bright backlit display. The display features easy-to-follow full-text explanations of all control settings, as well as help screens with comprehensive diagnostics and troubleshooting information. In the event of a boiler error or lock-out, the touch screen display turns red and flashes. The display connects to the IQ control through a simple plug-in connection.

IQ Aquastat Option CardAn additional temperature sensing device that will disable the boiler if it exceeds the built-in temperature limit. Required by local code in some areas, the Aquastat Option Card plugs easily into the IQ Option Panel and connects to the temperature sensor with a single plug-in connection. IQ Aquastat cards feature built-in diagnostics, adjustable setpoint & differential, and manual reset versions are compliant with CSD-1 in the U.S. and Canada.

The IQ Boiler Control System Available EXCLUSIVELY from

IQ Low Water Cut-Off (LWCO) Option CardAn auxilliary safety device designed to disable the boiler if it senses that the water level has dropped below safe operating limits. In some areas this device is required by code to be on every new boiler installation. Available in auto and manual reset versions, the IQ LWCO Option Card plugs easily into the IQ Option Panel and feature a one-wire connection to the 3/4” sensor probe which is mounted in the near boiler system piping. These cards feature built-in diagnostics, adjustable setpoint & differential, and manual reset versions are compatible with CSD-1 in the U.S. and Canada.

IQ Option card; Low Water Cutoff with Manual Reset

IQ Option card; Low Water Cutoff with Automatic Reset

IQ Option card; Aquastat with Manual Reset

IQ Option card; Aquastat with Automatic Reset

PartNumber Description

102723-01 IQ Outdoor Reset Option Card

102771-01 IQ LWCO Option Card - Auto Reset

102714-01 IQ LWCO Option Card - Manual Reset

102717-01 IQ Hi Limit (Aquastat) Option Card - Auto Reset

102720-01 IQ HI Limit (Aquastat) Option Card - Manual Reset

IQ Option Card List

Ratings

Specifications

ModelNumber*

Input(MBH)

DOEHeatingCapacity

(MBH)

I=B=RWaterRatings(MBH) AFUE%

ElectricalRequirements

ESC3 70 60 52 85.5 < 2 AmpsESC4 105 90 78 85.4 < 2 AmpsESC5 140 120 104 85.3 < 2 AmpsESC6 175 150 130 85.2 < 2 AmpsESC7 210 179 156 85.0 < 2 AmpsESC8 245 208 181 84.5 < 2 AmpsESC9 280 238 207 84.0 < 2 Amps

ModelNumber

Dimensions(inches) Connections(inches) WaterContent(gal.)

Approx.ShippingWt.(lbs.)Width(W) Height Depth Vent Intake

ESC3 14 41 33 3 3 2 250ESC4 15-1/2 41 33 3 3 3 300ESC5 18-1/2 41 33 3 4 4 350ESC6 21-1/2 41 33 3 4 5 410ESC7 24-3/4 41 33 3 5 6 460ESC8 24-3/4 41 33 4 5 7 510ESC9 30-3/4 41 33 4 5 8 560

* Add suffix “N” for natural gas, or suffix “L” for LP gas models**Requirement for controls only, add for amp draw of circulators.

**

NOTES:

* Vent pipe minimum clearance to combustible material is (4) inches when vent is installed in a fully enclosed chased application, or (3) inches when vent is installed with at least one side open, similar to a joist bay application** Add height required to maintain 6” clearance from all breeching components*** Area of each opening 1 sq. inch for each 1,000 BTUH input - with minimum of 100 sq. Inches. Height of opening should be half the width. © 2011 U.S. Boiler Company, Inc. - Lancaster, PA

Phone: 1-888-432-8887 • www.usboiler.net

FLOORLINE

**

41”

4” “W” 1”

VENTINTAKE

34”ELECTRICAL

27”SUPPLY

18”GAS

15”RETURN

FLOORLINE0”

0” 4” 15”19”22”

4”

33”

1”

VENTILATION AIR INLET OPENINGS***

12” MAX

12” MAX

VENT INTAKE

USBL11091