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Stiebel Eltron Mini™-E 3-1 Thermostatic Handwashing Sink Electric Tankless Water Heater

SKU 236010
Original price $299.00 - Original price $299.00
Original price
$299.00 - $299.00
Current price $299.00
in stock

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The Stiebel Eltron Mini-E 3-1 tankless water heater is designed for installation at the point-of-use, or under the sink. 120V- 3.0 kW Thermostatic

The Mini heats water instantaneously as it flows through the unit. Stand-by heat losses are completely eliminated. The efficient heating elements are controlled by a simple flow switch. Additionally, all Mini water heaters are equipped with a safety high limit with a manual reset.

Mini™-E thermostatic tankless water heaters are the new electronically controlled version of our famous Mini™ tankless electric water heaters for handwashing. The Mini™-E 2-1, 2.5-1, 3-1, 3.5-1 and 4-2 models ship with a 0.5 GPM pressure compensating flow reducer / aerator. All aerators are designed to fit the most common faucets. No pressure relief valve, drains, or circulating pumps are needed.


  • Code-compliant thermostatic control
  •  Adjustable temperature output between 86–120°F
  •  Custom temperature settings available
  •  Same extremely compact design as mechanical Mini
  •  Pre-wired pigtail included
  •  Major energy savings
  •  Unlimited supply of hot water
  •  Proven reliability
  •  Sleek design is appealing and can be mounted in plain sight
  •  Can be mounted with fittings pointing up or down
  •  Mini-E models are suitable for booster applications, accepting a maximum incoming water temperature of 122 °F (50 °C).

* The heater comes with a factory pre-set 100°F. 

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Mechanical modelsMini™ 3-1 (220816)Mini™ 3.5-1 (232099)Mini™ 4-2 (222039)Mini™ 6-2 (220817)
Thermostatic ModelsMini™-E 3-1 (236010)Mini™-E 3.5-1 (236136)Mini™-E 4-2 (236009)Mini™-E 6-2 (236008)
Phase - 50/60 Hz1
Voltage120 V120 V240 V or 208 V240 V or 208 V
Wattage3.0 kW3.5 kW3.5 kW2.6 kW5.7 kW4.3 kW
Amperage25 A29 A15 A13 A24 A21 A
Min. recommended circuit breaker size (1)25 A (SP)30 A (SP)15 A (DP)25 A (DP)
Min. recommended wire size (2)10/2 AWG 10/2 AWG14/2 AWG10/2 AWG
Minimum water flow to activate unit 
Mechanical Units0.40 gpm (1.5 l/min)0.40 gpm (1.5 l/min)0.40 gpm (1.5 l/min)0.77 gpm (2.9 l/min)
Thermostatic Units0.30 gpm (1.15 l/min)0.30 gpm (1.15 l/min)0.30 gpm (1.15 l/min)0.48 gpm (1.8 l/min)
Water temp. range Electronic units are adjustable from 86–122°F (30–50 °C)
Energy Factor (EF) (Mechanical / Thermostatic)0.99 / 0.99 0.99 / 0.99 0.99 / 1.00.99 / 1.0
Weight3.44 lb (1.56 kg)
DimensionsWidth 7½" (19.0 cm) x Height 6½" (16.5 cm) x Depth 3¼" (8.2 cm)
Water volume in unit0.026 gal (0.1 l) 
Minimum pressure30 psi (2 bar)
Working pressure150 psi (10 bar)
Tested to pressure300 psi (20 bar)
Water connections (4)3 /8˝ O.D. flexible braided stainless steel hose connectors

Mini™ 2-1 is internally restricted to 0.32 gpm (1.2 l/min). Mini™-E 2-1 is internally restricted to 0.40 gpm (1.5 l/min).

 All Mini™ models ship with appropriately sized pressure compensating flow-reducer/aerators that must be installed. 

1 Nominal mains voltage is 110–120 V and 220–240 V. 

2 This is our recommendation for overcurrent protection sized at 100% of load. Check local codes for compliance if necessary. Tankless water heaters are considered a non-continuous load. 

3 Copper must be used. Conductors should be sized to maintain a voltage drop of less than 3% under load. 

4 Mechanical units suitable for supply with cold water only. Thermostatic units can accept inlet water of 122 °F.


Mini/MiniE Brochure and Sizing Guide

Specifications and Installation Guide

Use and care/Warranty Information

Crossover Guide

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