Best High Efficiency Water Heater

RINNAI RXP199iN Condensing Tankless Water Heater RXP199 Features 0.96 UEF with 199k BTU and Pump.

Rinnai RSC199iN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater, Up to 11 GPM, Indoor Installation, 199,000 BTU

T-H3-DV-P Indoor Tankless High Efficiency Condensing Water Heater (LP)

RINNAI Ru Series Sensei Se+ Tankless Hot Water Heater: Indoor Installation

Corro-Protec™ Powered Anode Rod for Water Heater, 20-Year Warranty, Eliminates Rotten Egg/Sulfur Smell within 24 hours, Stops Corrosion and Reduces Limescale, Electrical Anode Rod Made of Titanium

CAMPLUX Tank Water Heater Electric,18 Gallon Point of Use Instant Hot Water Heater 120v 1500W, Built-in Reliable T&P Relief Valve, Anode Rod for Hot Water Heater, UL Listed

ALECOIL 50,000 BTU Hydronic Hot Water Hanging Unit Heater with Water Temperature Control Switch HHA50 Water to Air Heat Exchanger with Fan for Outdoor Wood Furnaces, Garage and Warehouse Heating

RINNAI Ru Series Sensei Se+ Tankless Hot Water Heater: Indoor Installation

Takagi T-H3-DV-N Condensing High Efficiency Natural Gas Indoor Tankless Water Heater, 10-Gallon Per Minute

Ranein 65,000 BTU RV Tankless Water Heater, High Altitude Available, 12V, CSA Certificated, with Black Door and Multi-function Controller, On Demand Instant Hot Water Heater, Compatible with all RVs