Rheem Performance RTEX-06T 6kW Electric Tankless Water Heater (Point of Use)

The Rheem Performance RTEX-06T 6kW Electric Tankless Water Heater is the mid-tier point-of-use electric tankless — 6kW capacity for single-faucet or low-flow shower service. Digital thermostat, 5-year heat exchanger warranty, compact form factor for under-sink and small-closet installs.

Headline specifications

• Model: RTEX-06T
• Type: Point-of-use electric tankless
• Power: 6kW at 240V
• Max flow rate: ~1.5 GPM at 35°F rise; ~2.0 GPM at 50°F rise
• Min activation flow: 0.3 GPM
• Temperature range: 80°F – 140°F (digital control)
• Warranty: 5-year heat exchanger, 1-year parts
• Dimensions: 11" H × 8" W × 4" D
• Circuit: 30-amp 240V

Who this model is for

Single-fixture point-of-use with shower demand, low-flow head (1.5 GPM): remote ADU showers, RV/cabin installs, pool-house bathroom, garage apartment with single occupant. The 6kW unit at warm-climate inlet (50°F+) handles a single low-flow shower without depletion. At cold inlet (35°F), it caps at sink-only flow.

For single-faucet only or warmer-climate installs, drop to RTEX-04T for ~$50 less. For full-shower demand at colder inlets, step up to RTEX-08 or higher.

Where it beats the alternatives

Vs RTEX-04T: RTEX-06T adds ~50% more capacity for ~$50 more. Step up if your application includes shower at any flow.

Vs Eemax HA006240 6kW: spec-equivalent. Eemax stronger in commercial install network; Rheem stronger in residential / big-box. Tie-breaker on retailer.

Vs Performance 10G Mini-Tank: tankless has no standby losses, no capacity limit (continuous within GPM), no anode rod maintenance. Mini-tank simpler install (120V plug-in option). For high-frequency low-demand use, tankless wins on operating cost over 6+ years.

Where it falls short

1.5 GPM at cold inlet is the practical limit. Standard 2.0 GPM showerheads will draw insufficient hot at 35°F inlet.

30-amp 240V circuit required.

1-year parts warranty.

No WiFi or app integration.

Lower brand recognition in electric tankless than EcoSmart / Stiebel.

Install considerations

30-amp 240V dedicated circuit. 1/2" NPT plumbing. Wall-mount. Verify panel has 30-amp capacity available.

Install cost: $300–$650 depending on electrical work.

Maintenance

• Annual descaling in hard-water regions
• Inlet filter clean annually
• Element check at year 4

Bottom line

The Rheem Performance RTEX-06T is the small-shower point-of-use electric tankless — 1.5 GPM at cold inlet, 5-year warranty. Right pick for ADU/cabin single-shower at warm-climate inlet. For colder climates or higher flow, step up to RTEX-08.