EcoSmart ECO 27 Tankless Water Heater - Compact Cold-Climate Electric

In this review of the EcoSmart ECO 27 tankless water heater the bottom line is simple: this unit is built for homes that need reliable on-demand electric hot water in colder climates or for higher flow applications. It stands out because it is explicitly configured to handle incoming water temperatures down to 37 degrees, delivering nearly 3 gpm under those conditions and up to 6.5 gpm with warmer inlet water. For buyers who want precise control and high energy efficiency without a large storage tank, this model is a practical, space-saving option.

Key Features

• Cold-climate ready: Configured to operate when inlet water can be as low as 37 degrees, making it suitable for northern homes.
• Modulating power: Self-modulating flow sensor technology applies only the energy needed, helping maintain steady outlet temperature and improving efficiency.
• Digital temperature control: A clear digital display allows precise outlet temperature adjustment in 1 degree increments for consistent comfort.
• Compact footprint: At roughly 17 x 17 x 3.5 in and weighing about 11 lb it mounts easily in mechanical closets or small utility spaces.
• High efficiency: With a listed energy efficiency of 99.8% and a copper heat exchanger, it minimizes standby losses and electrical waste.
• Robust electrical design: Uses three 9 kW heating elements and requires 3 sets of 8 AWG wiring and three 40 A breakers, offering strong heating capacity for larger demand.

Who It's For

The EcoSmart ECO 27 is best for homeowners in cold climates or properties with moderate to high hot water demand who can provide the required electrical service (240 V, 112 A draw). It is a good fit where space is limited and where precise temperature control and instant hot water are priorities.

It is not ideal for sites without adequate electrical infrastructure or for users who need continuous very high flow rates from multiple simultaneous fixtures beyond the unit's capability; such buyers should consider larger commercial solutions or multiple units.

Pros & Cons

Pros

• Very efficient operation with self-modulating control that reduces energy use during low demand.
• Precise digital temperature control in 1 degree increments for consistent comfort.
• Designed for cold inlet temperatures, so it performs well in northern climates where inlet water can reach 37 degrees.
• Compact and lightweight, making installation in tight spaces straightforward.

Cons

• Requires substantial electrical capacity (three 40 A breakers and 3 sets of 8 AWG), which may need panel upgrades and higher installation cost.
• Some users report mixed experience with sustained hot water delivery and concerns about product lifespan in real-world use.

Specifications

Model	ECO 27 (electric, 27-kW)
Power	27 kW, 240 V, single phase
Flow rate	Approx. 2.7 to 6.5 gpm depending on inlet temperature
Inlet temperature rating	Operates with inlet down to 37 degrees
Dimensions	17 x 17 x 3.5 in
Electrical requirements	112 A draw; (3) 40 A breakers; required wire: 3 sets 8 AWG
Materials & safety	Copper heat exchanger; (3) 9 kW Emerson elements; UL and CSA certified

Our Verdict

The EcoSmart ECO 27 is a strong choice for households that can meet its electrical requirements and need a compact, efficient tankless option that performs in cold climates. It offers precise digital temperature control and excellent energy efficiency, but buyers should budget for a potentially higher installation cost and pay attention to long-term reliability reports when planning ownership.

Frequently Asked Questions

Can this unit handle multiple showers?
Yes, depending on inlet temperature it can supply several showers simultaneously at moderate flow rates, but maximum gpm depends on your incoming water temperature.

What electrical upgrades are needed?
The unit draws about 112 A and requires three 40 A breakers and 3 sets of 8 AWG wire, so many homes will need a panel capable of that load.

Is it energy efficient?
Yes, the manufacturer lists an energy efficiency of about 99.8% and the self-modulating technology helps reduce wasted power.