Rinnai I Series Plus C Combi Boiler, 150,000 BTU Heat, 199,000 BTU Hot Water

This Rinnai I Series Plus C condensing combi boiler supplies both space heating and domestic hot water from one unit. It pairs 150,000 BTU of central heating with 199,000 BTU for hot water and up to 9.8 GPM of flow. It is a wall-hung, direct-vent unit rated up to 96% AFUE.

The fully modulating burner covers 15,000 to 199,000 BTU for hot water, feeding a stainless steel water-tube condensing heat exchanger and a plate heat exchanger for domestic water. Expect about 5.1 GPM at a 70 °F rise, with 9.8 GPM possible at low rises and activation from just 0.4 GPM. The heating pump is factory-installed, an outdoor temperature sensor is included, hot water priority/proportional control is standard, and operating sound is about 43-47 dB(A).

Direct venting runs up to 75 ft in 2 in. or 160 ft in 3 in. PVC, CPVC or PP twin pipe, or through a 3 x 5 in. concentric kit; Ubbink 2 in. PP flex vent is supported to 50 ft, and room-air installation is approved where code allows. The electrical supply is 120 V at 60 Hz with a 14 A maximum including external pumps and thermostats.

Highlights

• 150,000 BTU central heating plus 199,000 BTU domestic hot water

• Hot water flow up to 9.8 GPM

• Up to 96% AFUE condensing efficiency

• About 5.1 GPM at a 70 °F rise; activation at 0.4 GPM

• Factory-installed heating pump; outdoor temperature sensor included

• ENERGY STAR, ANSI Z21.13 / CSA 4.9, ASME and SCAQMD Ultra Low NOx

Specifications

In the box

• Factory-installed central heating pump

• 30 psi central heating pressure relief valve

• Outdoor temperature sensor

• Vent top with integrated 2 in. PVC or 3 x 5 in. concentric adapter

• Wall mounting bracket

• Manuals

Good to know

• Gas-fired appliance: it must be installed, vented and commissioned by a qualified installer in line with local codes and the manufacturer's installation manual.