Camplux TEW18 vs Rheem RTEX-11

Last updated: October 31, 2026

The Camplux TEW18 is the better tankless water heater overall, rated 3.0 to 2.4. The Camplux TEW18 leads on value and heating power. The Rheem RTEX-11 wins on warranty. The Rheem RTEX-11 costs $9.96 less ($268.99 vs $278.95).

Camplux TEW18 vs Rheem RTEX-11

Higher rated
Camplux TEW18
#13 in Electric3.0Full review

A budget whole home heater for a small home in a warm climate. Buyers who want published flow and efficiency figures should pay more for a Stiebel or EcoSmart.

Amazon $278.95
$278.95

Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.

Which should you buy?

Scores side by side

Each factor is scored 0-100 against the same fixed reference points for every electric tankless water heater; a clear win is highlighted. How we rank explains each one.

Factor weightCamplux TEW18Rheem RTEX-11
Overall rating3.0/52.4/5
Value 35%81 $15.50 per kW ($278.95, 18 kW)46 $24.45 per kW ($268.99, 11 kW)
Heating power 25%28 18 kW0 11 kW
Efficiency 15%50 UEF not published (neutral score used)25 0.92 UEF
Warranty 25%0 3-year heat exchanger warranty29 5-year heat exchanger warranty

Specifications

Camplux TEW18Rheem RTEX-11
Heating
FuelElectricElectric
Electric power18 kW11 kW
Max flow-2.7 GPM
UEF-0.92
Installation
Voltage240 V240 V
Breakers80 A total50 A total
Weight-6.5 lb
Features
Built-in recirculationNoNo
Wi-FiNoNo
Heat exchanger warranty3 years5 years
Parts warranty2 years1 year

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