Condensing Boiler

Get Installation Quote

Get a Quote

Want more information? Let's connect you with the three Rinnai dealers nearest you.

E50C click to zoom into photo of
  • Most efficient combi boiler on the market—95.6% AFUE
  • Cost-effective, simplified installation—fewer components needed
  • No primary secondary piping or closely spaced tees required*
  • No system pumps required—reduces install time and cost
  • Fewer maintenance intervals required than the competition— Inspection every two years or 4,000 hours; Service every four years or 8,000 hours
  • 13,600 to 50,000 BTU heating load
  • Proprietary stainless steel heat exchanger for unmatched performance and durability
  • Greater control—system temperature adjustable in two-degree increments
  • Automatic de-aeration at start-up

Width: 19.7 inches

Height: 25.6 inches

Depth: 15.6 inches



Heating Input

50,000 BTU

Minimum Input

13,600 BTU

Gas Pressure

3.0” W.C.

Gas Line Size


DHW at 75° Rise


Turn-Down Ratio


Low Loss Header Kit

As Accessory

Gas Type

Natural Gas (propane conversion kit)

Venting Type

2 Pipe/Concentric

High Altitude

10,000 ft

Get more information about this boiler unit delivered to your inbox.

We will also include the contact information of three professional installers near your location or you can find a dealer now.