Model: WH-AZ021-M3
from $340
ENVO Atami 21 kW 4 GPM Residential Single Phase Indoor Tankless Electric Water Heater with Limited lifetime warranty features dimensions of 15.16 inches high, 3.54 inches wide, and 10.24 inches deep. It delivers 21 kW of power for 4 GPM, requiring 87.5 Amps and utilizing a 3/4” NPT water connection.
Sizing is critical; a tank that is too small leads to cold showers, while one too large wastes energy. Consider heat pump (hybrid) models if replacing electric, as they pay for themselves in energy savings. Available from $340.
Water heaters are the second largest energy user in the home. Heat pump models drastically reduce electricity usage but cost more upfront.
Common Failure Modes
Tank leaks due to internal corrosion are fatal and require complete replacement. Heating elements in electric tanks and thermocouples in gas tanks are common, easily fixable failures.
Sizing is critical; a tank that is too small leads to cold showers, while one too large wastes energy. Consider heat pump (hybrid) models if replacing electric, as they pay for themselves in energy savings.
Tank water heaters last 8 to 12 years on average. Tankless water heaters can last 15 to 20 years. The single most important factor is water quality — hard water dramatically shortens lifespan by accelerating sediment buildup and anode rod consumption.
The ENVO Atami 21 kW 4 GPM Residential Single Phase Indoor Tankless Electric Water Heater with Limited lifetime warranty is available at homedepot, starting at $340.
Water heaters are the second largest energy user in the home. Heat pump models drastically reduce electricity usage but cost more upfront.
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