Call 7 days a week from 8am to midnight.   |   305-823-6991

EcoSmart ECO-18 Electric Tankless Water Heater 18KW 2+ Bath

$ 475.00

Free shipping on everything! No minimum order.

Having trouble selecting the right heater? We're only a phone call away until midnight every day.

Call us at 305-823-6991

Perfect for a large apartment or townhome with 2 bathrooms

Ideal for a large apartment/townhome with up to 3 people. The Eco Smart ECO 18 is the mid-range model that can heat over 2.5 gallons per minute. So it can handle a shower and a sink in cool climates. In warmer climates, it can handle two showers and two sinks. 

  • Savings of up to 50% on water heating costs
  • The most advanced, self-modulating technology available, meaning the ECO 18 will adjust how much energy needs to be input based on how much hot water is needed
  • Stylish and advanced design that is pleasing to the eye
  • Digital temperature control in 1-degree increments allows control of hot water
  • Copper and stainless components designed for efficiency, durability and easy replacement
  • Compact size saves valuable storage space
Dimensions (in.) 18" x 14" x 3.75"
Weight 11.25 lbs.
Exchanger Copper
Protection Thermal Auto
Temperature Control Digital
Activation flow: .25 GPM
Energy efficiency: 99.8 %
Certification: ETL Listed to UL 499 & CSA
Warranty Lifetime*
Tech Specs
Voltage 240
Phase Single
KW 18 kW
Elements 2 x 9 KW @ 240
Amperage Draw 75.0 Amps
Required Breaker 2 x 40 DP
Required Wire 2 x 8 AWG
Electrical Panel 150 Amps
HZ 50/60
Pipes fittings 3/4" NPT

Full color installation diagram for EcoSmart ECO-18 Tankless Water Heater


Ask a Question
  • Does this unit come with a warranty?

    All EcoSmart water heaters feature a limited lifetime warranty on electronic components as well as heat exchangers.

  • What size fittings does this unit have?

    The EcoSmart Eco-18 tankless water heater uses 3/4” fittings on both the inlet and outlet, both located on the bottom of the unit.

  • What electrical specifications are required for this unit?

    The EcoSmart Eco-18 tankless water heater runs on 240 volts, and is a two-line heater. It pulls 150 amps, calling for 2 Double Pole 40 amp breakers, and 8/2 wire (8 gauge).

  • How many bathrooms can this unit provide hot water for?

    The EcoSmart Eco-18 tankless water heater is a large capacity unit, with 18KW of heating power, this unit is ideal for 2.5 baths in warm climates, and up to 1.5 bathrooms in colder climates.

  • How many GPM

    Approx. 10 GPM @ 60 psi.

  • Is a pressure relief valve required

    Yes highly recommended.

  • Power is off why

    We can help you diagnose the issue with Ecosmart 18kw. Please call us at 305-823-6991.