10 Best Outdoor Tankless Water Heater of December 2025

• Endless hot water for your entire home
• V65eN HE High Efficiency Tankless Hot Water Heater - Natural Gas: Outdoor Installation Only
• Up to 6.5 GPM hot water flow rate (varies by groundwater temp)
• Control-R 2.0 mobile app features timers and schedules throughout the day and allows you to remotely put the system into vacation mode.
• Residential Factory Warranty - 120 months (heat exchanger), 12 months (labor), 60 months (parts)

Rinnai

• Rated for 2-3 applications used simultaneously means that taking a shower and running two sinks at the same time is effortless. The Eccotemp 20H is ideal for normal hot water heating applications in ANY size residential single-family home.
• Best in class 10-year product warranty offers peace of mind that the Eccotemp 20H will withstand the time and use you need. The Eccotemp 20H can be complemented with our patented one of a kind EZ-Flush descaling kit to ensure your tankless water heater is running at maximum efficiency all year long.
• Rated at 6.0 GPM at 150,000 BTU with a temperature rise of 38 degrees this ultra-efficient tankless water heater is ideal for just about every single-family home in the US and Canada. With Advanced incoming and outgoing water temperature sensor technology you always have total confidence when it comes to safety.
• CSA certified for installation in the US and Canada. This tankless water heater meets and exceeds all safety and efficiency requirements according to the DOE. With an Energy Factor Rating of .83, you can have peace of mind knowing this tankless water heater is ideal for individuals looking to save money.
• Advanced Generation 3 Computer board with high performance processing and smart adjust technology built in. Our proprietary developed programming meets and exceeds today’s consumer demand needs.

Eccotemp

• Exclusive Water Savings technology conserving up to 1, 100 gallons per year
• 157, 000 BTU (gas consumed per hour)
• Exclusive Hot Start Programming minimizes cold water burst by staying in ready-fire state
• Recirculation pump ready kit ready
• For use outdoors with freeze protection up to -30 degrees
• Fuel Type: Natural Gas

Rheem

• CONVENIENT HOT WATER HEATER: 2.5 gallon point-of-use mini-tank fits under your sink to provide hot water right where you need it. Thermal efficiency is 98%. Dimensions : 13.75 W x 13.75 H x 10.75 D Inches
• LONG LASTING QUALITY: This electric water heater is easy to maintain and has premium glass-lined material for a long service life. (Amps 12A, Volts (VAC) 120)
• INDEPENDENT INSTALLATION: 36-37" cord plugs into a 120 volt outlet for independent installation or in-line with a large hot water source
• FAST RECOVERY RATE: Eliminates long waits for hot water at your sink, get on demand hot water at your every need (supplies up to 2 sinks at a time)
• EASILY MOUNTED: Can be shelf, wall or floor mounted (bracket included); simply tap into the cold water line and install the water heater directly at the sink to provide hot water

Bosch Thermotechnology

• 【INSTANT & SUFFICIENT HOT WATER】Applied with 5.5KW heating system, the electric water heater supplies instant, consistent and endless hot water of 116℉or higher temp shortly, no waiting for preheat nor terrible temp up & down, perfect companion for sinks. Time to get rid of those "lukewarm" toys.
• 【SMART SELF ADJUSTMENT】The hot water heater adjusts power input based on flow rate and temp setting in real time. For example, less power will be applied by the system when waterflow reduced, thus you still get ideal temperature instead of scalding hot water, which means comfortable experience. Optimal energy efficiency of 98% saves considerable electric charge.
• 【CONVENIENT USE】The tankless water heater comes with digital display & touch control panel so temp setting is easy job. Now turn on the tap and let the smart unit do the rest, you needn’t go through hard lesson about temp setting by a mixer tap without any hint. The Black model comes with Remote control, useful for installation under sink.
• 【SAFE and DURABLE】Applied with multiple protection devices, every piece goes through strict tests to ensure 100% safe. Inner water and electricity lines are designed to run separately so as to avoid leakage or harm of scale build up. Approval by ETL and qualifies for UL, you can expect outstanding performance for years to come.
• 【POINT of USE】The sleek tankless water heater is compact as an oatmeal box, making it possible to install anywhere close to outlet and avoid energy waste. It can be mounted horizontally, vertically, obliquely, ideal for kitchen, bar, school, hospital, community and hair salon. Please verify it is the right size for you: 5.5kW@240V; dimensions 11" x 7.5" x 2.35"; pipes fittings :1/2" NPT.

ECOTOUCH

• 2.5-gallon point-of-use mini-tank fits under your sink to provide hot water right where you need it
• Electric water heater is easy to maintain and has glass-lined tank for long service life
• Thermostat Control allows adjustment of water temperature.High Limit device provide protection while overheating.
• Plugs into 120 volt outlet for independent installation or in-line with a large hot water source.(Max. water pressure is 150 PSI,CSA listed Temperature & Pressure relief valve included)
• Can be shelf, wall or floor mounted ; Simply tap into the cold water line and install the water heater directly at the sink to provide hot water. Product dimension:11.75" W x 17.25" H x 10.38" D.

CAMPLUX ENJOY OUTDOOR LIFE

• 【PREMIUM QUALITY】- Tankless water heater; Gas Supply: LPG(Liquid Propane Gas); Power: 36KW; Hot Water Output: 18L/min(4.8GPM); Anti-rust stainless steel case, high-temperature resistant copper water devices. Also come with a propane gas regulator & hose, and a water filter.
• 【EFFORTLESS CONTROL】- Clear LED display of current water temperature, rotate gas supply & water output control knob to adjust hot water temperature easily. Also provide summer/winter mode to select for energy saving.
• 【MULTI-LEVEL PROTECTION】- Care much about safety on use, thus to adopt several protection methods, like: Over 75℃ protection, low water flow protection etc. Also can start at low water pressure, come with a shower head kit as gift.
• 【WALL-MOUNT DESIGN】- It is light-weight, portable and tankless to installed on the wall for space-saving. Copper standard G1/2" hose connectors, φ4.5" smoke exhaust pipe output(not include).
• 【DIVERSIBLE APPLICATION】- CE passed product, fast to heat, perfect for bathroom showering, hand washing, or pet showering, sink cleaning. Provide you constant hot water, especially on winter or cold places. Enjoy a cozy showering at any time.

VEVOR

• Lifetime warranty
• Save up to 60-percent on your water heating cost with an ECOSMART electric tankless water heater
• Never run out of hot water with an ECOSMART tankless water heater
• Patented Self Modulating Technology and design
• ECOSMART tankless water heaters are 99.8-percent energy efficient.Uniform Energy Factor:0.98

Ecosmart

• Being Designed and developed in Summerville SC USA, The Eccotemp L5 is the only legal CSA Certified portable tankless water heater on the market that can legally be sold in the US and Canada!
• Lightweight, easy to carry, and compact, makes using it for camping, hunting, in your Tiny Home, RV’s, Poolside, Washing Pets, Equestrian, Cleaning Vehicles, Greenhouses or anywhere else that you need instant reliable endless hot water perfect for hot water anywhere you need it.
• Runs on a standard 20 lb. liquid propane tank and is equipped with an electronic ignition. Powered by 2 “D” cell batteries, making it ideal for on-the-go. Make the L5 even more convenient and pair it with the EccoFlo 12v water pump, allowing you to have hot water in the most remote locations!
• Real, appointment based dedicated support available M-F, 8am-8pm EST. Eccotemp also offers live chat and 24/7 self help desk to keep you in HOT WATER. With educated technical support, manuals, troubleshooting all available at your fingertip you’ll have peace of mind when purchasing an Eccotemp product.
• Rated at 1.5 GPM the L5 can produce hot water with water pressure as low as 20PSI and achieve temperatures ranging from 50-140 degrees F. Simply adjust the water and gas flow to achieve your desired temperature.

Eccotemp

• Endless hot water for your entire home
• RL75eP HE+ High Efficiency Tankless Hot Water Heater - Propane: Outdoor Installation Only
• Up to 7.5 GPM hot water flow rate (varies by groundwater temp)
• Circ-Logic technology allows you to set recirculation patterns that coincide with your typical habits. Hot water is available when you need it!
• Residential Factory Warranty - 120 months (heat exchanger), 12 months (labor), 60 months (parts)

Rinnai