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Rinnai 37AHA045 Front
Rinnai 37AHB04508KA5
45,000 BTU, 1.5 to 2 Ton Cooling, Hydronic Air Handler

Product has been discontinued.
Please call us for a suitable alternate product.

Mon - Fri 8:30am - 5:00pm Central

The newly designed Rinnai® multi-position hydronic air handlers offer a unique solution for a wide variety of small and medium sized residential and light commercial applications.  They are compact and able to fit in tight spaces which may include attics, basements, closets, crawlspaces and utility rooms.

The 37AHB units are equipped with an intelligent microprocessor control that allows for domestic hot water priority and adapts to available hot water flow for space heating by automatically regulating the pump and fan sequence to maximize comfort.

These unique hydronic air handlers are designed to work in combination with our line of Rinnai tankless water heaters to deliver heating capacities that cover a wide spectrum of residential and light commercial heating applications.  For these air handlers to provide cooling, a seperate outdoor condenser and evaporator coil must be installed.

Standard Features

  • Multi-position: Upflow, downflow, horizontal left or horizontal right without modifications
  • Modifiable for side-entry return air
  • Low-flow, high-head pump custom designed to work with Rinnai's tankless water heaters
  • Integrated control board with learning algorithm
  • No combustion air infiltration losses when used with a Rinnai tankless water heater
  • Four selectable heat blower off delay times
  • Multi-speed ECM motor
  • 20 gauge, prepainted, fully insulated, galvanized steel 
  • Multi-position control box
  • Designed for serviceability
  • Schrader valves to purge air from the system
  • Integral filter rack with filter
  • Five year parts, 1 year labor warranty

Instructions & Brochures

Rinnai 37AHB Spec Sheet (pdf, 441 KB)
Rinnai 37AHB Installation Instructions (pdf, 1.12 MB)
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(800) 865-5931
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1901 N. Clybourn Avenue
Suite 200
Chicago, IL 60614
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