RHEEM EEMAX & ECOSMART Terminal Block HA-P036

The RHEEM EEMAX & ECOSMART original-equipment terminal block used on 18 kW electric tankless water heaters from Rheem, Eemax, EcoSmart, Richmond, and compatible iHeat/Drakken models. It provides secure, labeled incoming-power connections (typically two pairs of L1/L1 and L2/L2 terminals) so each 40-amp double-pole breaker feeds the correct heating circuit without crossed wires. Replacing a cracked, burned, or loose block restores reliable power delivery, reduces the risk of arcing or overheating at the connection points, and keeps the unit operating at its designed capacity. The part is a direct OEM swap no modifications required when the exact model match is confirmed.

Dimensions

Compact internal electrical component. Exact size is not published as a standalone spec; it mounts in the factory location inside the heater cabinet. Visual match to the original block is the best verification.

Compatibility

Designed for 18 kW units that use a 4-pole (two-circuit) terminal block:

• Eemax HomeAdvantage HA018240
• Eemax ProAdvantage PR018240
• Eemax EEM24018
• Rheem RTEX-18 / RETEX-18
• Richmond RMTEX-18
• EcoSmart Eco18 (listed as TB MED)
• iHeat/Drakken AHS18D / AH18

Not for 24 kW, 27 kW, or 36 kW models (those use 6- or 8-pole blocks). Always confirm the number of heating elements and breaker requirements on the unit data plate before ordering. Professional installation recommended; disconnect all power before service.