Rinnai Condensing Boilers

Q Series - Ideal for homes or light commerical
An outstanding choice for light-commerical applications or any home with a separate indirect hot-water source, our wall-mounted boilers free up valuable floor space while maintaining maximum comfort in your home.

condensing boiler Q series diagram
Gas Valve

2. Fan

3. Exhaust/Intake

4. Stainless Steel Heat Exchanger

5. 6.6 Gallon (25 L) DHW Indirect Tank (Q175C Model)

6. Boiler Pump

7. Integrated Thermostatic Mixing Valve for DHW



E Series - Heating and Hot water in one compact model
Perfect for homes with 1 or 2 baths, E Series Combi Boilers ensure homeowners won't have to sacrifice continuous hot water..

condensing boiler E series diagram


1. Gas Valve

2. Fan

3. Exhaust/Intake

4. Stainless Steel Heat Exchanger

5. DHW Plate Heat Exchanger

6. Boiler Pump

7. Three way Motorized Valve Allows Boiler to Switch Between Heating and DHW

8. Expansion Tank

Boiler Accessories

In order to optimize overall performance and provide durability, every Rinnai boiler includes a factory-assembled low-loss header. The easy-to-install low-loss header eliminates the need for balanced pump sizing, simplifying system design. This reduces installation time compared to traditional closely-spaced tees with factory-assembled kit. It is a space-saving compact design. There is a more efficient heat transfer and reduced heat loss due to fully-insulated header.

low loss header1. PRV

2. Boiler Supply

3. Supply Connection for Indirect Tank

4. Pressure and Temperature Gauge

5. Boiler Drain

6. Supply System/Di-Electric Union

7. System Return/Di-Electric Union

8. Boiler Return

q series unique benefits header
Benefits Unique to Q Series
The four "S" boiler models deliver energy-efficient home heating and offer an optional 3 way diverter valve to simplify installations that have an indirect tank.
Consistent temperature is delivered using a thermostatic mixing valve in our Q175C combiheating/hot-water boiler with an onboard 6.6 gallon (25 L) gallon fully-insulated, indirect tak.
There's no wasted energy with the fully-modulating boiler pump that uses justthe BTU needed to meet the immediate demand (The maximum BTU input ranges from 85,000 to 205,000).
Installation flexibility allows venting up to a total of 200 feet - 100 feet exhaust and 100 feet intake.

e series unique benefits header
Benefits Unique to E Series
The space-saving, wall-mounted design integrates the boiler pump and heating expansion tank (Excluding the E50C boiler model).
A plate-warming feature delivers faster hot-water.
Continuous hot water is available via domestic hot water priority.
The design provides increased efficiency to meet your home's needs, with a maximum BTU heating input from 75,000 to 110,000.
A stainless steel domestic hot-water plate heat exhanger creates proven long-lasting durability.
The E50C is specifically designed for multifamily applications or smaller single-family homes with up to 1.5 baths with no secondary piping or closely-spaced tees required.

venting options