Rinnai RE180iN 180,000 BTU Indoor Non-Condensing Natural Gas Tankless Water Heater

Rinnai RE180iN 180,000 BTU Indoor Non-Condensing Natural Gas Tankless Water Heater

The Rinnai RE180iN is a high-performance 180,000 BTU indoor non-condensing tankless water heater designed for homes that need strong, reliable hot water delivery without stepping up to a full 199,000 BTU system. Built for indoor installation, this model provides continuous on-demand hot water using a traditional non-condensing venting system.

Ideal For:

• 2–3 bathroom homes
• Households with moderate to higher simultaneous usage
• Replacing older indoor non-condensing tankless units
• Homes with existing Category III stainless steel venting
• Installations where condensing PVC venting is not preferred

Key Features

• 180,000 BTU (180 MBH) maximum input
• Indoor non-condensing design
• Natural gas configuration (iN model)
• Wall-mounted, space-saving installation
• Advanced safety controls and self-diagnostic system
• Reliable Rinnai heat exchanger technology
• Continuous hot water without standby loss

Performance & Application

The RE180iN provides strong performance for mid-sized homes requiring dependable simultaneous hot water use. It is a practical option when upgrading from older non-condensing systems or when stainless steel venting is already in place.

Non-Condensing vs Condensing

This unit uses a non-condensing heat exchanger and requires Category III stainless steel venting. While condensing models offer higher efficiency and PVC venting, the RE180iN remains a solid choice for retrofit installations where existing venting infrastructure is already compatible.

Installation Requirements

• Indoor installation only
• Category III stainless steel venting required
• Proper gas line sizing for 180,000 BTU input
• 120V electrical outlet required
• Professional installation recommended

Compare With Other Rinnai Models

• Need more capacity? Consider RE199iN (199,000 BTU)
• Looking for higher efficiency? Explore Rinnai condensing RX models
• Browse our full Tankless Water Heater collection for additional options

Why Buy From United Plumbing & Fire Supply?

• Trusted plumbing supply serving Los Angeles
• Local pickup available
• Competitive pricing
• Nationwide shipping options

Frequently Asked Questions

Is the RE180iN condensing?
No. This is a non-condensing tankless water heater that requires stainless steel venting.

Is this model natural gas?
Yes. The “iN” configuration is designed for natural gas.

Is this enough for a 3 bathroom home?
Yes, in many 2–3 bathroom homes with moderate simultaneous usage, 180,000 BTU provides strong performance depending on groundwater temperature.

Can this unit be installed outdoors?
No. The RE180iN is designed strictly for indoor installation.

Available for local pickup in Los Angeles or nationwide shipping. Contact United Plumbing & Fire Supply for availability and ordering support.