Ranein Natural Gas Tankless Water Heater, 3.6 GPM, 80,000 BTU, Indoor

Price: $298.99
(as of Oct 23, 2026 15:01:52 UTC – Details)

Product description

Ranein Gas Tankless Water Heatear

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Customer Reviews

4.1 out of 5 stars 745

4.1 out of 5 stars 745

4.1 out of 5 stars 745

4.1 out of 5 stars 745

4.1 out of 5 stars 745

4.1 out of 5 stars 745

Price

$299.00$299.00

$399.00$399.00

$599.00$599.00

$699.00$699.00

$579.00$579.00

$699.00$699.00

Water Points

Bathroom x 1, Kitchen x 1

Bathroom x 2, Kitchen x 1

Bathroom x 2, Kitchen x 2

Bathroom x 3, Kitchen x 3

Bathroom x 2, Kitchen x 2

Bathroom x 3, Kitchen x 3

Suggested Housing

Apartment

Apartment, Townhouse

SFR, Townhouse

Single Family Residence

SFR, Townhouse

Single Family Residence

BTU

80,000 BTU

100,000 BTU

130,000 BTU

190,000 BTU

130,000 BTU

190,000 BTU

GPM

2.0- 3.6 GPM

2.2- 4.3 GPM

2.9- 5.3 GPM

4.2- 8.5 GPM

2.9- 5.3 GPM

4.2- 8.5 GPM

Mounting Location

Indoor Installation

Indoor Installation

Indoor Installation

Indoor Installation

Outdoor Installation

Outdoor Installation

Input Voltage

110- 120 Volts (AC)

110- 120 Volts (AC)

110- 120 Volts (AC)

110- 120 Volts (AC)

110- 120 Volts (AC)

110- 120 Volts (AC)

Gas Inlet

1/2″ NPT

1/2″ NPT

3/4″ G

3/4″ G

3/4″ G

3/4″ G

Cold Water Inlet

1/2″ NPT

1/2″ NPT

1/2″ NPT

3/4″ G

1/2″ NPT

3/4″ G

Hot Water Outlet

1/2″ NPT

1/2″ NPT

1/2″ NPT

3/4″ G

1/2″ NPT

3/4″ G

Flue Pipe Dia

Φ 3″

Φ 3″

Φ 3.15″

Φ 3.9″

No need

No need

Water Pressure Range

14- 150 PSI

3.6- 116 PSI

3.6- 116 PSI

3.6- 116 PSI

3.6- 116 PSI

3.6- 116 PSI

Minimum water flow

0.7 GPM

0.75 GPM

0.75 GPM

0.75 GPM

0.75 GPM

0.75 GPM

Powerful On-Demand Heating: 80,000 BTU & 3.6 GPM for this tankless water heater natural gas, supports 2-3 water points simultaneously, delivers endless natural gas hot water on demand with no waiting.
Precision Temp Control: Gas-water-temperature intelligent dynamic linkage, 95°F-149°F adjustable range, eliminates hot/cold spikes, safe for kids and elders.
Double Heating Chamber & Energy-Saving: Dual heating chambers boost efficiency, ensure uniform temp and stable supply; quieter, safer, paired with optimized combustion and heat retention for energy saving.
Oxygen-Free Copper Heat Exchanger: Enhances heat transfer, corrosion-resistant and durable; complements dual heating chamber for better performance.
4 Preset Modes + Child Lock: One-click switch for Dish/Fruit/Elderly/Infant modes; child lock prevents accidental adjustment, anti-scald for family use.
All-Round Safety & Anti-Freeze Protection: Equipped with overheat, dry burn and exhaust blockage protection; powerful fan prevents CO leakage. Built-in anti-freeze device resists -5℃/23°F low temperature.
Included Vent Pipe & Installation Note: Comes with original vent pipe (no extra purchase, saves money). Install by licensed professionals, not for >2,000ft elevation. Recommend draining water completely if temp drops below -5℃/23°F or unused for long to prevent pipe cracking.
Customers find the water heater reliable and easy to install, taking less than half an hour to set up. The device maintains consistent temperature and provides hot water on demand, with one customer noting it can handle multiple faucets simultaneously. They appreciate its quick heating speed, with one mentioning a 10-second temperature rise from 64°F to 125°F, and its energy efficiency in reducing gas bills. While some customers report the unit is still going strong, others mention it failing after 8 months of use. Additionally, several customers report leakage issues from inside the unit.