Rheem 18kW Tankless Water Heater
Where to Buy
| Retailer | Price | Last seen | Buy |
|---|---|---|---|
A Aikocol | $99.99 | Apr 11, 2025, may have changed | Buy Now |
 Amazon Sold by Amazon Resale | $264.82 | Mar 4, 2025, may have changed | Buy Now |
 Wayfair 30-day returns · free shipping on $35+ | $384.67 | Apr 11, 2025, may have changed | Buy Now |
M miamiwaterheater | $399.95 | Apr 11, 2025, may have changed | Buy Now |
B bigbigmart | $401.42 | Apr 11, 2025, may have changed | Buy Now |
Prices are collected from retailer listings; each row shows the date we last saw that price. Return and shipping terms are each store's standard policy from our retailer research (April 2026). Some products and categories have different terms, so check with the store before you buy.
Used & Refurbished
✨ See 3 used & refurbished prices with ShopSavvy ProGet the app →Pros
- •Effectively provides hot water for a home with multiple bathrooms and simultaneous uses, such as showers and laundry.
- •Compact design saves space, making it suitable for replacing larger tank systems.
- •Installation is straightforward for DIY enthusiasts; offers significant space savings.
- •Provides consistent hot water with no temperature fluctuations after the initial setup.
- •Offers significant cost savings compared to traditional tank water heaters.
- •The tankless model eliminates stagnant water issues, contributing to a sense of cleanliness.
- •Accompanies a value kit that simplifies water flow adjustment and initial troubleshooting.
- •Positive feedback on performance from users over several months.
- •Supports multiple simultaneous hot water sources effectively.
- •Maintains user satisfaction with the performance and efficiency of the model.
Cons
- •Requires significant amperage and larger wiring, which may need panel upgrades.
- •May struggle to reach optimal temperatures through smaller pipes in cold weather.
- •Filling a bathtub might exceed the heater's output capacity; controlled flow is advised.
- •Installation, if not DIY, can be costly due to electrical and plumbing modifications.
- •Additional components like valve kits and fittings can increase overall cost.
- •Brief waiting period for hot water to reach certain faucets after turning on.
- •Requires annual maintenance for hard water flushes, potentially needing professional service.
- •Some homes might need an inline recirculation pump for optimal performance.
- •Difficulties with providing instant hot water for simultaneous showers and other uses without additional equipment.
- •Installation location challenges in colder climates noted by some users.
Bottom Line
The Rheem 18kW 240V Tankless Electric Water Heater is an excellent choice for those looking to save space and energy while maintaining effective hot water delivery for homes with multiple bathrooms. It's particularly beneficial in homes where space saving and avoiding stagnant water are a priority. Despite some electrical and installation hurdles, overall user satisfaction with the model suggests it offers reliable performance and long-term cost savings for the energy-conscious homeowner. If temperature consistency is a concern, especially in colder climates, consider additional equipment like a recirculation pump to enhance performance.
What Reviewers Are Saying
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Discussion
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