---
product_id: 573429703
title: "Ranein Natural Gas Tankless Water Heater, 4.3 GPM, 100,000 BTU, Indoor"
brand: "ranein"
price: "$1178.86"
currency: USD
in_stock: true
reviews_count: 13
category: "Ranein"
url: https://www.desertcart.us/products/573429703-ranein-natural-gas-tankless-water-heater-4-3-gpm-100
store_origin: US
region: United States of America
---

# 4.3 GPM flow rate 100,000 BTU powerhouse All-round safety & anti-freeze Ranein Natural Gas Tankless Water Heater, 4.3 GPM, 100,000 BTU, Indoor

**Brand:** ranein
**Price:** $1178.86
**Availability:** ✅ In Stock

## Summary

> 🔥 Elevate your home comfort with endless hot water on demand!

## Quick Answers

- **What is this?** Ranein Natural Gas Tankless Water Heater, 4.3 GPM, 100,000 BTU, Indoor by ranein
- **How much does it cost?** $1178.86 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/573429703-ranein-natural-gas-tankless-water-heater-4-3-gpm-100)

## Best For

- ranein enthusiasts

## Why This Product

- Trusted ranein brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safety First, Always:** Anti-freeze protection down to 14°F, plus overheat, dry burn, and CO leak prevention for peace of mind.
- • **Smart Seasonal Modes:** One-click presets for 4-season, kitchen, bathtub, and shower modes tailor your perfect temperature effortlessly.
- • **Durable & Energy Efficient:** Oxygen-free copper heat exchanger plus advanced combustion tech means longer life and lower bills.
- • **Endless Hot Water, Zero Wait:** Power through 3-4 water points simultaneously with 4.3 GPM and 100,000 BTU—never compromise on comfort.
- • **Precision Temperature Control:** Adjust from 95°F to 155°F with intelligent gas-water linkage and high-temp lock for family-safe use.

## Overview

The Ranein Natural Gas Tankless Water Heater delivers powerful, on-demand hot water at 4.3 GPM and 100,000 BTU, supporting multiple water points simultaneously. Featuring four intelligent preset modes, precise temperature control (95°F-155°F), and a durable oxygen-free copper heat exchanger, it ensures energy efficiency and longevity. Comprehensive safety features include anti-freeze protection, overheat and CO leak prevention, plus a clear LED display with temperature memory. Designed for indoor use with included vent pipe, this unit is a smart, reliable upgrade for modern homes.

## Description

Ranein Natural Gas Tankless Water Heater, 4.3 GPM, 100,000 BTU, Indoor | Endless hot water for whole home, 3-4 water points, 95-155F, 4 preset modes, anti-freeze, LED, vent pipe, energy saving - desertcart.com

Review: Quality right out of the box. - Installation was easy since I was replacing an old tankless heater. This one worked perfectly right off the start. I chose a slightly higher GPM due to the bottom mounted fan for longevity. I am so far very pleased with the unit.
Review: DIY , watch your gas consumption go down - This product is what it says it is natural gas hook up 80,000 BTUs this unit is good enough to run laundry machine. I full bath in a few minutes. Endless shower approximately 123° perfect. The unit is very self-sufficient and remember to buy the connections they provide. Other than hooking it up to your waterlines in lit outlet very easy to follow instructions. FYI DIY compatible and do follow airflow instructions and don't forget about the bladder tank if you don't have one you'll definitely need if you have bladder water bad water pressure. Then after hooking up the natural gas line 2 unit double check for leaks you spray bottle with a little bit of dawn dish soap or dish liquid spray and watch for bubbles if no bubbles you are OK. Plug-in unit 120 outlet close by with a GFI do note that GFI should be on one breaker instead of existing plug. no need for wiring since it has a plug itself built in. Fits any exterior wall double chuck waterlines turn unit on by faucet automatically starts warming water. I hope this little review helped you out enjoy your blessed day , future pictures coming soon

## Features

- Powerful On-Demand Heating: 100,000 BTU & 4.3 GPM for this tankless water heater gas, supports 3-4 water points simultaneously, delivers endless hot water on demand with no waiting.
- 4 Intelligent Preset Modes: One-click switch for 4-season/Kitchen/Bathtub/Shower modes; 4-season auto-matches temp, kitchen defaults to 100°F, bathtub supports 50-800L volume adjustment.
- Precision Temp Control: Gas-water-temperature intelligent linkage, 95°F-155°F adjustable range, high-temp lock prevents scalding, safe for kids and elders.
- Oxygen-Free Copper Heat Exchanger: Enhances heat transfer efficiency, corrosion-resistant and durable; paired with enhanced combustion tech for energy saving.
- All-Round Safety & Anti-Freeze Protection: Equipped with dedicated anti-freeze device, resists 14°F/-10°C low temperature to effectively prevent pipe freezing and cracking; plus overheat, dry burn, exhaust blockage and low water pressure startup protection; powerful fan exhaust prevents CO leakage.
- Clear LED Display & Temp Memory: LED screen shows real-time water temp, operating status and fault codes; temp memory retains preferred settings, no repeated adjustment needed.
- Included Vent Pipe & Installation Note: Comes with original vent pipe (no extra purchase) for the indoor propane tankless water heater. Install by licensed professionals, not for >2,000ft elevation. Recommend draining water completely if temp drops below 14°F/-10°C or unused for long to prevent pipe cracking.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0C6PYS9D2 |
| Best Sellers Rank | #23,040 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #4 in Water Heaters |
| Brand | Ranein |
| Brand Name | Ranein |
| Capacity | 4.3 gallons |
| Color | Gray-NG |
| Customer Reviews | 4.2 out of 5 stars 317 Reviews |
| Flow Rate | 4.3 gpm |
| Heat Output | 100000 british thermal units |
| Included Components | Assembly Kit x1, Tankless Water Heater x1, Use’s Manual x1, Vent Pipe x1 |
| Item Dimensions W x H | 14.17"W x 22.05"H |
| Item Type Name | tankless water heater NG |
| Manufacturer | Ranein |
| Manufacturer Warranty Description | 2 Year Manufacturer |
| Material Type | Natural Gas |
| Maximum Pressure | 116 psi |
| Maximum Temperature | 155 °F |
| Model Number | RH10K |
| Mount Type | Wall |
| Number of Items | 1 |
| Power Source | Natural Gas |
| Product Dimensions | 14.17"W x 22.05"H |
| Special Feature | LED Display |
| Special Features | LED Display |
| Style Name | Natural Gas |
| Voltage | 120 volts_of_alternating_current |
| Wattage | 7.8 watts |

## Product Details

- **Brand:** Ranein
- **Capacity:** 4.3 gallons
- **Power Source:** Natural Gas
- **Product Dimensions:** 14.17"W x 22.05"H
- **Special Feature:** LED Display

## Images

![Ranein Natural Gas Tankless Water Heater, 4.3 GPM, 100,000 BTU, Indoor - Image 1](https://m.media-amazon.com/images/I/51iBRnavawL.jpg)
![Ranein Natural Gas Tankless Water Heater, 4.3 GPM, 100,000 BTU, Indoor - Image 2](https://m.media-amazon.com/images/I/71VvWXaoo8L.jpg)
![Ranein Natural Gas Tankless Water Heater, 4.3 GPM, 100,000 BTU, Indoor - Image 3](https://m.media-amazon.com/images/I/719RNDS87IL.jpg)
![Ranein Natural Gas Tankless Water Heater, 4.3 GPM, 100,000 BTU, Indoor - Image 4](https://m.media-amazon.com/images/I/61X1wx3dj8L.jpg)
![Ranein Natural Gas Tankless Water Heater, 4.3 GPM, 100,000 BTU, Indoor - Image 5](https://m.media-amazon.com/images/I/71OzeHURZmL.jpg)

## Available Options

This product comes in different **Color, Set** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Quality right out of the box.
*by P***S on July 18, 2026*

Installation was easy since I was replacing an old tankless heater. This one worked perfectly right off the start. I chose a slightly higher GPM due to the bottom mounted fan for longevity. I am so far very pleased with the unit.

### ⭐⭐⭐⭐⭐ DIY , watch your gas consumption go down
*by J***Y on May 24, 2026*

This product is what it says it is natural gas hook up 80,000 BTUs this unit is good enough to run laundry machine. I full bath in a few minutes. Endless shower approximately 123° perfect. The unit is very self-sufficient and remember to buy the connections they provide. Other than hooking it up to your waterlines in lit outlet very easy to follow instructions. FYI DIY compatible and do follow airflow instructions and don't forget about the bladder tank if you don't have one you'll definitely need if you have bladder water bad water pressure. Then after hooking up the natural gas line 2 unit double check for leaks you spray bottle with a little bit of dawn dish soap or dish liquid spray and watch for bubbles if no bubbles you are OK. Plug-in unit 120 outlet close by with a GFI do note that GFI should be on one breaker instead of existing plug. no need for wiring since it has a plug itself built in. Fits any exterior wall double chuck waterlines turn unit on by faucet automatically starts warming water. I hope this little review helped you out enjoy your blessed day , future pictures coming soon

### ⭐⭐⭐⭐⭐ Easy install, works as advertised
*by W***E on August 1, 2026*

The real test will be durability. It has been operating less than a year, but for the price, this seems like an easy decision. Mine supplies hot water to three sinks.

## Frequently Bought Together

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-08-26*