Rinnai 37AHB, 37AHB04508KA5, 37AHB06012KA5, 37AHB07514KA5, 37AHB09016KA5 Specifications

37AHB Series Hydronic Furnace

The optimum in hydronic technology, the newly
designed Rinnai® multi-position hydronic furnaces
offer a unique solution for a wide variety of small- and
medium-sized residential and light commercial
applications. They are compact and ready to fit in tight
spaces which may include, but not limited to, attics,
basements, closets, crawlspaces, and utility rooms.

Intelligent Microprocessor Controller

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.

Fine Tuned to Work with Rinnai Tankless
Water Heaters

These unique hydronic furnaces 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. When combined, the units form the Rinnai
Tankless Heating System, the first matched, tankless
hydronic heating solution in the industry!

PATENT PENDING

FEATURES

● Four models covering a range of heating capacities

○ 27,100 to 96,300 BTU/hour

● Multi-position (upflow, downflow, horizontal left,

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 motors (ECM)

● Strong 20-gauge steel cabinet

○ Galvanized, painted

○ Fully insulated cabinet

○ Low 34 inch profile

● Multi-position control box

● Designed for serviceability

● Schrader valves to purge air from the system

● Integral filter rack with filter

Part of the Rinnai Tankless Heating System

AHB90

AHB75

AHB60

AHB45

This product is manufactured in a

Equipment

CABINET

20 gauge
prepainted
galvanized steel
fully insulated

HEAT
EXCHANGER

copper tube
aluminum fin

PUMP

high-head
low-flow
integrated check valve

BLOWER
ASSEMBLY

multi-speed motor (ECM)

37AHB Series Hydronic Furnace

Accessories

THERMOSTATS

Programmable, 5-2 days;
both A/C and heat pump
versions

FLOW SENSOR *

For domestic hot water priority
* Supplied with the unit

ANTI-SCALD MIXING
VALVE

To maintain safe domestic
hot water temperature

FILTER RACK
and BOTTOM FILL PLATES

For modification to allow side-entry
return airflow

CONTROL
BOARD

integrated
microprocessor based

FILTER

Voltage Code (V- Ph-HZ)

K = 115 - 1 - 60
L = 240 - 1 - 50 (export models)

Coo ling / H e a ting
Air Flow Range ( CFM)

08 = 800 (650-800)
12 = 1200 (650-1200)
14 = 1400 (1000-1600)
16 = 1600 (1200-1750)

AHB45 (BTU) AHB60 (BTU) AHB75 (BTU) AHB90 (BTU)

120º F

27,700 36,400 43,700 54,900

130º F

33,300 45,100 52,900 63,900

in. mm in. mm in. mm in. mm in. mm

37AHB04508KA5 (AHB45) 14 355.6 18 457.2 12 304.8 10 - 1/2 266.7 19 482.6

37AHB06012KA5 (AHB60) 17 -1/2 444.5 18 457.2 16 406.4 16 - 11/16 423.9 19 - 1/ 4 489

37AHB07514KA5 (AHB75) 21 533.4 18 457.2 20 508 18 - 11/16 474.7 19 - 1/ 2 495. 3

37AHB09016KA5 (AHB90) 24 - 1/2 622.3 18 457.2 24 609.6 21 - 1/8 536.6 19 482.6

UNIT SIZE

ABCDE

37AHB spec sheet inside (7-2010).ai 7/23/2010 11:58:33 AM37AHB spec sheet inside (7-2010).ai 7/23/2010 11:58:33 AM