Best Lightweight Water Heaters in 2025

Original Design: Tankless hot water heater only heats when necessary to conserve energy; For the latest in non-condensing technology and a cleaner layout that speeds up service and installation, check out our new RE160eN model

Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 6.5 GPM (5 fixtures at once)

Smart, Durable Design: Enhanced scale detection helps prevent serious, long-term damage to unit; Includes 15-, 5-, and 1-year residential guarantee for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)

Installation Guide. We recommend that all installations must in accordance with the local building and plumbing codes of the installation location, install the hot water heater by a licensed professional plumber.

Instant Hot Tankless Water Heater. Camplux advanced 6.86 GPM high capacity natural gas tankless water heater delivers 6.86 gallons per minute of on-demand endless hot water. It is suitable for 3-4 outlet points, which can satisfy whole family.

Easy Installation. It won't take up your indoor space, keeping your home more airy and having a more comfortable living experience. The tankless water heater includes digital remote control with a 3.3 feet cable for convenient flow control.

IMPRESSIVE 45,000 BTU’S: With Golden Flame’s XL-Series natural gas heater, you can enjoy being outside even in the coolest of months. The wide reflector hood, crafted from aluminum, is combined with stainless steel burners to generate heat up to a 15-foot radius. While in use, the heater releases water vapor to help prevent dry air. Ideal for backyards, outside screened-in porches (with proper clearances), restaurant outdoor patios, and more.

EASY PRESS, EASY START: Featuring a rapid spark electronic ignition system, one press brings on the heat! While operating on natural gas, this XL-Series heater has an advanced “pilotless” burner system. The variable heat control knob allows for trouble-free adjustment from low to high heat and anywhere in-between.

SAFETY FIRST: This heater comes equipped with an automatic tilt sensor that shuts off the burner if it starts to tip. The base includes a reservoir for adding sand. Once filled, the sand adds 25lbs. of weight providing extra stability during breezy conditions. The base enclosure also allows for adding and concealing up-to an additional 50lbs. of weight for added stability during windy conditions.

IMPRESSIVE 45,000 BTU’S: With Golden Flame’s XL-Series natural gas heater, you can enjoy being outside even in the coolest of months. The wide reflector hood, crafted from aluminum, is combined with stainless steel burners to generate heat up to a 15-foot radius. While in use, the heater releases water vapor to help prevent dry air. Ideal for backyards, outside screened-in porches (with proper clearances), restaurant outdoor patios, and more.

EASY PRESS, EASY START: Featuring a rapid spark electronic ignition system, one press brings on the heat! While operating on natural gas, this XL-Series heater has an advanced “pilotless” burner system. The variable heat control knob allows for trouble-free adjustment from low to high heat and anywhere in-between.

SAFETY FIRST: This heater comes equipped with an automatic tilt sensor that shuts off the burner if it starts to tip. The base includes a reservoir for adding sand. Once filled, the sand adds 25lbs. of weight providing extra stability during breezy conditions. The base enclosure also allows for adding and concealing up-to an additional 50lbs. of weight for added stability during windy conditions.

Endless Hot Water: Enjoy unlimited hot water flow throughout the house; compact, durable, and easy to install; professional installation recommended

Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary.

Optimal Water Pressure: High-performance up to 5.3 GPM hot water flow rate for a powerful, constant stream

We recommend that all installations of units must be done by the local building and plumbing codes of the installation location and installation be done by a licensed professional.

The tankless design means you don't have to wait 30 minutes for preheating and unlimited use of hot water.

145,000 BTU high heating capacity and maximum 6.3 GPM. It is suitable for 3-4 outlet points, which can satisfy whole family. UEF over 0.81, the high energy conversion rate can effectively reduce energy loss.

2.64 GPM Instant Hot Water -Camplux 2.64 GPM natural gas tankless water heater delivers 2.64 GPM on demand endless hot water ensures instant hot water for any small homes, cabins or apartments. On demand water heater only heats the water when you need it and no waiting for preheat.

6-IN-1 Multiple Protection- Flame-out protection, anti-freezing protection （manual drainage needed）, over-heating protection, air flow pressure switch protection to ensure the safety. Safe electronic ignition system, plugs into standard 120V electrical outlet with UL-listed cord.

Easy Installation -The tankless water heater uses standard 1/2" BSP water fitting and gas inlet. The water heater comes with 1/2 " BSP female to 1/2" NPT male gas connector adapter then you want hook this water heater to natural gas pipe directly.It also comes with 2" horizontal vent pipe,ensures efficient power ventilation. Minimum activation rate: 0.65 GPM; Maximum input rating: 68,000 BTU; Water connection location/size: Bottom/0.5-inch NPT.

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

We recommend that all installations of units must be done by the local building and plumbing codes of the installation location and installation be done by a licensed professional.

The tankless design means you don't have to wait 30 minutes for preheating and unlimited use of hot water.

180,000 BTU high heating capacity and maximum 8.1 GPM. It is suitable for 3-5 outlet points, which can satisfy whole family. UEF over 0.81, the high energy conversion rate can effectively reduce energy loss.

【Outdoor installation to save space】The product is installed outdoors and does not occupy the living space. The bottom built-in forced DC fan eliminates the influence of external wind. So as to ensure the stability of combustion, achieve safety, energy saving and no pollution. We recommend that all installations are carried out in accordance with local building and plumbing codes by licensed professionals.

【Endless water supply without preheating】The heat exchanger quickly heats the water to a maximum of 140°F, which is ready for use without waiting for hot water. It can run at approximately 6.3 GPM for 40 minutes, enough to produce almost 240 gallons of hot water. Make a multi-point water supply for the whole house to meet your family's water needs.

【Precise temperature control and stable temperature】Equipped with a wire controller cord length of 164ft, allowing you to control the water temperature indoors. The burner can be burnt in sections to meet the water temperature demand in the four seasons. Benefiting from the calculation and control of the heating power 1000/s by the chip, the temperature difference of the water can be precisely controlled within ±2°F.

Energy and Space Efficient: Space-saving design conserves energy as it only heats when necessary; multiple venting options offer installation flexibility

Optimal Water Pressure: High-performance 11 GPM hot water flow rate for a powerful, constant stream

Instant Heating: Circ-Logic technology enables recirculation patterns that coincide with your typical habits; Wi-Fi monitoring creates hot water on demand

Hot water without the wait - or the waste

Low operating cost - High energy efficiency and water savings setting

Space Savings - Compact, space-saving design. Perfect for a tank replacement.

【Outdoor installation to save space】The product is installed outdoors and does not occupy the living space. The bottom built-in forced DC fan eliminates the influence of external wind. So as to ensure the stability of combustion, achieve safety, energy saving and no pollution. We recommend that all installations are carried out in accordance with local building and plumbing codes by licensed professionals.

【Endless water supply without preheating】The heat exchanger quickly heats the water to a maximum of 140°F, which is ready for use without waiting for hot water. It can run at approximately 5.1 GPM for 40 minutes, enough to produce almost 200 gallons of hot water. Make a multi-point water supply for the whole house to meet your family's water needs.

【Precise temperature control and stable temperature】Equipped with a wire controller cord length of 164ft, allowing you to control the water temperature indoors. The burner can be burnt in sections to meet the water temperature demand in the four seasons. Benefiting from the calculation and control of the heating power 1000/s by the chip, the temperature difference of the water can be precisely controlled within ±2°F.