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Compact rectangular undersink water heater in white finish with compression inlet fitting

Eemax

Eemax SPEX4277 Electric Tankless Water Heater 277V Single Phase 4100W

SKU CH-DPMP-7B7XS

Compact undersink heater delivers instant hot water at 277 V single-phase power for commercial kitchen and lavatory fixtures

  • Product typeWater Heaters
  • Compact 10.75 in height fits tight under-sink spaces
  • 277 V single-phase supply suits commercial electrical systems
  • 4100 W heating delivers up to 140 °F outlet temperature
  • 4 gpm activation works with sensor and metering faucets
  • 3/8 in compression inlet simplifies cold-water connection

Undersink Electric Tankless Heater

The Eemax SPEX4277 is a compact undersink electric tankless water heater designed for commercial indoor applications. It serves kitchen sinks, lavatory faucets, metering faucets and sensor faucets where on-demand hot water is required. The unit operates on a 277V AC single-phase supply and draws 15 A at 4,100 W. It delivers water between 70 and 140 degrees F at a maximum flow rate of 2 gpm.

Electrical and Plumbing Requirements

Verify that the installation site provides a dedicated 277V AC single-phase circuit rated for at least 15 A. The cold water inlet uses a 3/8 in compression fitting, so confirm compatibility with existing supply lines. The heater activates at a minimum flow of 0.4 gpm, so ensure the connected fixtures can meet this threshold. Mounting space must accommodate the unit's overall height of 10.75 in, width of 5.25 in and depth of 3 in.

Replaces Tank Heaters at Point of Use

This model replaces traditional storage tank heaters at individual fixtures, eliminating standby losses and recovering valuable cabinet space. The upgrade is worth it when hot water demand is intermittent and a continuous supply up to 140 degrees F is needed without waiting for a tank to reheat. It is not suited for whole-building supply or fixtures requiring flow rates above 2 gpm. Buyers needing higher capacity or multi-fixture service should consider larger capacity units.

How it compares

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

Price $187.99
Typical for this category: the median of 85 items is $163.99.

Specifications

Product
Brand nameEEMAX
Product typeWater Heaters

Questions about this item

What comes in the box and what must I buy separately for the SPEX4277?

The unit itself is supplied. You will need to provide a 277 V single-phase circuit rated for 15 A, a 3/8 in compression cold-water line and suitable indoor mounting hardware.

Which flow-rate version should I choose for a lavatory faucet?

The heater activates at .4 gpm and delivers up to 2 gpm, matching typical sensor and metering faucets in commercial lavatories.

What does the 4,100 W rating mean for daily hot-water use?

At 4,100 W the unit can raise water temperature from 70 °F up to 140 °F while flowing at the rated 2 gpm, providing continuous hot water for kitchen or lavatory fixtures.

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