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Compact white rectangular undersink water heater, smooth plastic casing, compression inlet, 12/2 cord visible

Stiebel Eltron

Stiebel Eltron Mini-E 2.5-1 electric tankless water heater

SKU CH-5S4A-QZ92V

Compact undersink electric tankless heater delivering 0.5 gpm at 120 V with adjustable thermostat from 86 to 122 °F

  • Product typeWater Heaters
  • Delivers instant hot water at 0.5 gpm maximum flow
  • Activates at just 0.3 gpm for low-demand fixtures
  • Adjustable thermostat sets temperature between 86 and 122°F
  • Compact 7.5 × 6.5 × 3.25 in fits under any sink
  • Runs on standard 120 V AC with 20 A draw

Undersink electric tankless water heater

The Stiebel Eltron Mini-E 2.5-1 is a compact electric tankless water heater designed for undersink installation. It suits commercial and industrial indoor environments where a small point-of-use hot water source is required. The unit operates on a 120V AC single-phase supply and draws 20 A.

0.5 gpm maximum flow with 2.4 kW heating

The heater delivers a maximum flow rate of 0.5 gpm and activates at a minimum flow of 0.3 gpm. It provides adjustable output temperatures between 86 and 122 degrees F. The 2,400 W element supplies enough power for low-demand fixtures but will not support higher flow rates or multiple outlets.

120V connection with compression inlet

A 12/2 AWG cord connects the heater to a 120V circuit. The cold water inlet uses a 3/8 in compression fitting. At 7.5 in wide, 6.5 in high and 3.25 in deep, the unit fits beneath most sinks, freeing floor space that a storage tank would occupy.

How it compares

Measured against everything we stock in Water Heater Parts & Add-Ons, at today’s prices. Recalculated every night.

Price $206.99
Pricier than about 57% of the 85 comparable items (median $163.99).

Specifications

Product
Brand nameSTIEBEL ELTRON
Product typeWater Heaters

Questions about this item

Will the 120 V 20 A supply I already have in the kitchen run this 2.5 kW heater without tripping the breaker?

The unit draws 20 A at 120 V for 2 400 W, so a dedicated 20 A circuit is required; sharing the circuit with other loads will likely trip the breaker.

How do I confirm the heater is delivering water between 86 °F and 122 °F once it is installed?

Open a hot tap until flow exceeds 0.3 gpm, let the temperature stabilise, then check with a thermometer; the adjustable thermostat should hold the output within the 86–122 °F range.

Does the box include the 3/8 in compression fittings and 12/2 AWG cord, or must I buy them separately?

The heater ships with a factory-attached 12/2 AWG cord and a 3/8 in compression cold inlet; no additional fittings or cord are needed for a standard undersink installation.

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