Series 300 Low Temperature Boiler

Series 300 Low Temperature Domestic Hot Water Boiler

Superior Boiler Series 300 Boilers for low temperature applications are efficient, ready-to-install packaged systems featuring a perfectly matched powerful and efficient burner and boiler combination. All necessary boiler controls and secondary plumbing are in place and pre wired, and the vessels easily fit through a 30″ doorway, resulting in a very quick start-up. Each vessel contains a 60 foot copper coil through which the domestic hot water is circulated. This coil is surrounded by the hot boiler water, which transfers heat to the coil. Firing rates for the Series 300 Low Temperature Boiler are available from 210,000 Btu/hr to 375,000 Btu/hr. However, many millions of Btu’s can be delivered by creating an efficient, fully modular system of up to 24 vessels operated by our computerized control panel.

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Design

The Series 300 Boiler is manufactured to exceed ASME Section IV standards and typically is used to provide supply temperatures from the coil of between 140-180°F, yet can accept extremely low return temperatures (well below 100°F) without shocking the boiler.  The temperature of the coil water is impacted by the temperature of the Space Heating side because the coil is immersed in that water. These vessels contain 37 vertical firetubes, each of which is 1½” diameter, each fitted with a high-efficiency turbulator for maximum heat transfer. The combustion chamber is fully water-backed, with burners that are UL listed. Vessel capacity is 35 gallons with a heating surface of 34 sq. ft. This boiler qualifies as a Category I gas appliance with industry standard controls wired to NEC specifications.

Safety

A well-made, heavy vessel is naturally a safer boiler. But Superior Boilers also have a firebox design that is completely backed by water, along with extra safety controls on the boiler that results in a very safe and secure package.

Standard Features

The following standard features include nationally known parts and controls that are available at most supply houses, allowing for quick and easy repair and maintenance, which can dramatically reduce down time:

  • UL Listed Gas Trains and Control Systems.
  • Choice of Power Burners.
  • Main and Auxiliary Gas Valves
  • Air Flow Switch
  • Main Manual Leak Test Valve
  • Bell and Gossett Circulating Pumps
  • Honeywell Aquastat Relay
  • Automatic Low Water Cutoff
  • Honeywell Second High-Limit With Manual Reset.
  • Burner Control Relay.
  • High Visibility Operating Light.
  • Pressure/Temperature Gauge
  • Pressure Relief Valve
  • 1½” Diameter Firetubes of SA178-A Steel
  • Turbulators for Maximum Heat Transfer
  • Two Inches of Insulation With a Painted Steel Jacket.

Support Documents

Cut Sheet (PDF)
Sample Spec (Word Doc)
O&M Manual (PDF)

Drawings

Series 300 Low Temperature Boilers
Model #
File
210-HEP
300-HEP
375-HEP

Boiler Efficiencies

Series 300 Low Temperature Boilers
Model
Input (BTU/Hr)
Gross OutPut
Combustion Efficiency
GPM @ Riseº F
Pressure Drop Thru the Coil
210-HEP
210,000
182,280
87.0%
7.3 @ 50º F
1.36
300-HEP
300,000
258,000
86.0%
10.3 @ 50º F
1.98
375-HEP
321,750
321,750
86.0%
12.9 @ 50º F
2.71

Boiler Dimensions

Series 300 Low Temperature Boilers
Feature
Dimension
Vessel Width
22"
Vessel Height
57.5"
Boiler Weight
800lbs
Boiler Depth w/ Burner
40"
Gas Inlet Height
11"
Return Water Inlet Height
7"
Top of Vessel to Bottom Main
8"
Height to Lower/Upper Coil Openings
22"/46"
Height to Pump Flange
31"
Height to Space Heater Return
18.5"
Height Required at Installation
82"
Clearance to Rear of Boiler
18"
Clearance to Front of Boiler
48"
Clearance to Side of Boiler
18"
Clearance Between Boilers
3"
Height to 300 HEP Vent
51.5"

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