Rheem 180,000 BTU Indoor High-Efficency Condensing Direct Vent Natural Gas Tankless Water Heater Model RTGH-90DVLN-3

Rheem 180,000 BTU Indoor High-Efficency Condensing Direct Vent Natural Gas Tankless Water Heater Model RTGH-90DVLN-3

• PVC Vent runs up to 60' (2"), 150' (3")

• The enhanced design is up to 20% smaller and lighter-making one-person installs even easier

• Industry Best! 1/2" side-to-side clearance allows you to work in spaces the safely competition can't 1/2" Gas line compatibility up to 24 ft (subject to local code)

Features

Rheem Exclusive! Hot-start Programming ensures the unit is in a ready state between back-to-back usage, minimizing any cold water bursts

Built-in EcoNet Wi-Fi technology for direct control from your device (on select models)

LeakGuard – All-inclusive leak detection and prevention system that detects any leak that comes from the unit (on indoor Wi-Fi models)

What Our Experts Think

• Continuous Hot Water on Demand: Tankless design delivers endless hot water without a storage tank, ideal for homes with multiple bathrooms or high usage

• High-Efficiency Condensing: Condensing heat exchanger maximizes energy use, reduces wasted heat, and lowers operating costs

• 180,000 BTU Natural Gas Power: Robust heating capacity supports simultaneous showers, laundry, and appliance use

• Indoor Direct Vent Design: Sealed combustion and direct venting improve safety and combustion efficiency

• Reliable Rheem Performance: Built with durable components and smart controls for consistent daily operation

Q&A

Q: What fuel does this water heater use?
A: Natural Gas (NG)

Q: Does it provide endless hot water?
A: Yes — continuous on-demand hot water without a storage tank

Q: Where is this unit installed?
A: Indoor with direct venting

Q: Who is this model best for?
A: Homes with moderate to high hot water demand, especially with multiple simultaneous uses

Maintenance Tips

• Annual Flushing: Flush the system yearly to reduce mineral buildup and maintain flow efficiency

• Clean Inlet Filter: Regularly clean the water inlet filter to sustain peak performance

• Inspect Venting & Air Intake: Keep vent and intake pathways clear of debris

• Check Gas Connections: Ensure natural gas lines and fittings are secure and leak-free

• Professional Inspection: Have a qualified technician inspect burners, heat exchanger, and controls annually for safe, efficient operation