P.O. Box 429 ∙ 120 Braley Road ∙ East Freetown, MA 02717
508-763-8071∙ Fax: 508-763-3769 / Commercial Tankless Water Heater
Model: CT-250
The CT-250 water heater, manufactured by HTP, Inc., offers a modulation input ranging from 30,000 to 250,000 Btu/Hr and shall operate on Natural or LP gas.
The water heater shall be National Board Listed and bear the ASME "HLW" Stamp with a maximum working pressure of 160 PSIG. The water heater shall have top inlet and outlet water connections, shall be used in an open loop system and require a properly sized thermal expansion tank to meet local codes. The water heater shall be ETL Listed and exceed the latest minimum efficiency requirements of ASHRAE 90.1b with a thermal efficiency up to 96%.
The water heater heat exchanger shall be constructed of laser welded 316L finned tube without any weld joints to secure the heat exchanger into the manifold or casing. The heat exchanger shall be designed to flex and minimize stress on joints to avoid long term failure. The heat exchanger shall be passivated after welding to resist surface corrosion. The heat exchanger shall be of vertical design and vertically positioned, which provides optimal condensation drainage and produces self-cleaning action inside the water heater. The water heater is built and tested in accordance with the harmonized ANSI Z21.10.3 water heater standard for the US and Canada. The complete heat exchanger assembly shall carry a six (6) year commercial use limited warranty.
The water heater shall be equipped with a premix modulating combustion system, allowing the unit to provide high turndown ratios of up to 8 to 1. The burner is constructed of high temperature metal woven fiber, providing operating reliability through the modulation range of the water heater. The negative pressure gas valve operates at very wide ranges of inlet pressure from 3 ½ to 14” of water column. Connection for the gas piping is provided on the top of the water heater.
The water heater cabinet shall be constructed with a heavy gauge steel jacket assembly, with built-in support brackets for wall-mounting. The water heater can also be mounted on an optional floor stand.
The water heater shall have an integrated digital control which monitors the incoming inlet and outlet temperatures and flow rates to assure a highly accurate temperature control. The premix modulating fan will adjust the fan speed to provide only the input necessary to meet hot water demand. The flow control valve assures that the water heater delivers the desired outlet temperature.
The control will provide the capability to cascade up to 10 water heaters for greater system turndown and back up reliability. Cascade loops will also provide unit rotation plus isolation within the cascading circuit for greater system efficiency when recirculation lines are used. The control will also monitor safety through a flue temperature sensor, water temperature limit control, and a flue pressure switch to ensure there is no blockage in the vent system. Freeze protection is also provided. Combustion systems have a built-in outlet check to eliminate back pressure issues in common vent installations. To provide additional domestic hot water, a hot water storage tank can be installed.
The water heater shall have a sealed combustion system, and use minimum 3” diameter ULC-S636 PVC, CPVC, Polypropylene, or Stainless Steel designed for Category IV venting to provide intake air for combustion and vent exhaust flue gasses to the outdoors. The water heater shall vent a distance of 130 combined equivalent feet. The vent connections shall be located on the top of the water heater.
CAUTION: Foam core pipe is NOT an approved material for either intake or exhaust piping.
The water heater can be vented in aTwo Pipe Direct Vent System, where the water heater intake and exhaust are both piped directly to the outdoors, or utilize a Single Pipe Power Vent System, where IndoorAir taken from a Confined or Unconfined Space is used for combustion and the exhaust is vented to the outdoors. Multiple cascaded water heaters may also be Common Vented. Refer to water heater installation manual venting section for additional venting requirements.
The water heater shall be in compliance with the NOx emissions limit set forth in SCAQMD Rule 1146.2. The manufacturer shall verify proper operation of the burner, the combustion and control systems, as well as all related safety functions, to ensure the water heater will operate based on its designed parameters before shipping. Complete operating and installation instructions shall be furnished with every heater as packaged by the manufacturer for shipping.
The water heater shall operate at altitudes up to 4,500 feet above sea level without additional parts or adjustments.
Maximum unit dimensions shall be: Mounting Depth 14 7/8 inches (set with included mounting bracket), Width 17 3/8 inches and Height 26 inches. Maximum unit shipping weight shall be 90 pounds.
NOTE: HTP reserves the right to make product changes or updates without notice and will not be held liable for typographical errors in literature.
LP-530 Rev 8.7.14