2025 GEN II Ranein Tankless Water Heater Electric, 18kW 240V On Demand Instant Endless Water Heater with Temperature Display, Control Knob, Up to 4.3 GPM for Whole House Water
Condition: New
Buy Now, Pay Later
As low as
$39.83
/ mo
Learn more
- – 6-month term
- – No impact on credit
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Selected Option
Free shipping on this product
30-day returns
Learn more
FREE refund/replacement until Jan 31, 2026
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
In Stock.
Arrives
Thursday, Jan 8
Recently Viewed
Style: RE18K
Features
- Important: 18 kW 240 V tankless electric water heater unit requires 2 dedicated 240 V circuits (2 40 A double-pole breakers + 2 8 AWG cables). Product size: 13.8" 3.1" 18.7". Water connection: 3/4" NPT.
- Powerful Performance: With 99% thermal efficiency and a 4.3 GPM flow rate, this 18 kW model handles 23 household water points with no sweat. No waiting for preheatingjust endless hot water, whenever you need it.
- Save Energy & Space: Unlike tank heaters, it skips preheatingno energy wasted when idle, slashing heating costs by 60%. Its compact design installs easily anywhere, saving way more space than traditional tanks. Plus, it delivers instant hot water on demand.
- Intuitive Precision Control: Adjust temperatures seamlessly (86F to 131F in 1F steps) via tactile knobs and LED display. Set your ideal heat once for consistent, stable output every use.
- Safe & Certified: CSA-certified (meets US/Canadian standards), its got leakage protection, overheat safeguards, drop-tested durability, and a damp-proof design. Every unit passes strict testing for 100% safety; stainless steel elements keep scale from building up, too.
- Instant Hot Water Experience: Equipped with rapid heating technology, it delivers near-instant hot water, minimizing wait time. Enjoy comfortable hot water on demand whenever you need it.
Brand: Ranein
Power Source: Electric
Product Dimensions: 13.8"W x 18.7"H
Special Feature: LED Display
Color: Gray
Brand: Ranein
Product Dimensions: 13.8"W x 18.7"H
Special Feature: LED Display
Color: Gray
Maximum Temperature: 131 Degrees Fahrenheit
Efficiency: 99%
Mounting Type: Wall
Is Electric: Yes
Manufacturer: Ranein
Item Weight: 17.41 pounds
Item model number: RE18K
Special Features: LED Display
Included Components: water heater×1
Batteries Included?: No
Batteries Required?: No
Date First Available: August 23, 2025
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Jan 8
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- PayTomorrow Financing
- Financing through Apple Pay
Learn more about financing & leasing here.
Top Amazon Reviews
Style: RE27K
It was not damaged when it arrived at my home. Very easy installation, Value for the money, Instructions easy to read.
Reviewed in the United States on December 3, 2025 by Talita Chase
Style: RE18K
Comes in handy
Reviewed in the United States on December 10, 2025 by Tammie Conner
Style: RE18K
Easy to install works as mentioned
Reviewed in the United States on November 17, 2025 by rev.John
Style: RE18K
Very good quality
Reviewed in the United States on October 12, 2025 by Motasem
Style: RE18K
The item does not work I’m in the process of returning the item so no stars
Reviewed in the United States on October 20, 2025 by TIMOTHY CRAIG ASCUE
Style: RE18K
I installed the 2025 GEN II Ranein Tankless Water Heater in my utility bathroom, and I’m impressed. This little unit packs a punch—18 kW heats water fast, and the 4.3 GPM flow keeps up with a shower and a sink running at the same time without dropping temp. The temperature control is super precise, letting me dial in exactly what I want, which is way nicer than fiddling with a traditional tank. Installation took a bit of planning since it needs two 240 V circuits, but once set up, it runs quietly and reliably. The compact design is a lifesaver—mounted right on the wall, it frees up a ton of space. I also like that it heats on demand, so no energy wasted waiting for a tank to warm up. Overall, it’s efficient, powerful, and built with solid safety features. For anyone looking to upgrade from a standard tank heater, this is a great DIY-friendly option. Instant hot water whenever you need it—exactly what I was hoping for.
...
show more
Reviewed in the United States on December 14, 2025 by CerealReviewer CerealReviewer
Style: RE18K
The Ranein GEN II Electric Tankless Water Heater provides on-demand hot water in just about three seconds, delivering up to 4.3 GPM—enough for whole-house use, including multiple showers, sinks, or appliances simultaneously. Its 18kW, 240V system ensures fast, consistent heating, while the digital temperature display and control knob allow precise adjustment for ultimate comfort and energy efficiency. Because it requires two individual 120V lines with 8AWG wiring and two 40A circuit breakers, professional installation is strongly recommended to ensure safety and compliance with electrical codes. The tankless design saves space and eliminates energy waste associated with traditional storage heaters. Overall, this unit is a high-performance, modern solution for homeowners seeking instant, endless hot water with precise control and whole-house capability.
...
show more
Reviewed in the United States on December 19, 2025 by Nhat Nguyen
Style: RE18K
This is a nice electric tankless water heater. Needs 2 dediated 240 volt power supply circuits. Powerful in a modern package. Easy to use with a dial and digital display. Good enough for a whole house. Good water heater.
Reviewed in the United States on December 14, 2025 by Rock