NISHCON EWH-00 Water Heater Thermostat Kit – Upper & Lower, Fits Most Dual-Element Heaters

Overview

Meet the NISHCON EWH-00 Water Heater Thermostat Kit, a practical replacement set designed for electric water heaters with two heating elements. This pair includes an upper and a lower thermostat, configured for non-simultaneous operation to help balance heating cycles, reduce wear on components, and deliver more consistent hot water when needed. Built for flexibility, the kit supports a broad voltage range and a wide temperature range, making it a versatile option for many homes.

Expect a sturdy, purpose-driven upgrade that combines reliable control with straightforward compatibility. The thermostats use a classic Thermo-O-Disc style and can interchange with Apcom type units, which helps simplify sourcing and maintenance for a variety of brands and models. The result is a practical improvement path for aging or malfunctioning thermostat assemblies, without requiring a full heater replacement.

What’s included

• 1 x Upper water heater thermostat
• 1 x Lower water heater thermostat
• Non-simultaneous control design for balanced heating cycles
• Temperature adjustment range: 90F to 150F
• Thermo-O-Disc TOD style; interchangeable with Apcom type
• Voltage compatibility: 120V to 480V

Performance and safety features

The kit includes a built-in safety switch to help prevent overheating and a complete set for renewing or repairing a water heater system. When installed correctly, you may experience more consistent hot water delivery and orderly cycling between the two elements, which can contribute to smoother operation over time.

Real-world use cases

Ideal for homes with aging dual-element heaters or systems experiencing temperature fluctuations. This kit can support a renewal path that avoids a full heater replacement, and it is suitable for both retrofits and mid-life upgrades in kitchens, bathrooms, and utility spaces where reliable hot water is important.

• Upgrading an older dual-element heater to restore stable temperatures
• Replacing failed thermostats to refresh heating cycles
• Maintaining dependable hot water in multi-user households

Compatibility and installation tips

Designed for broad compatibility, the EWH-00 kit fits many brands with dual elements, including Whirlpool, GE, Kenmore, A.O. Smith, Bradford White, and more. Easy installation is supported by practical guidance: avoid forcing components, bend the thermostat mounting clips as needed to fit snugly, and consider adding a point-of-use thermostatic mixing valve to reduce the risk of scalding. For safety, try to keep thermostat settings at or below 120F to balance comfort and protection from accidental scalding.

Maintenance and safety considerations

After installation, test the system with cold water first and verify proper operation across the heating cycle. Routine checks on connections and mounting clips can help maintain a secure fit and reliable performance, while keeping electrical safety in mind during any service work.

Warranty and support

The EWH-00 kit includes a one-year warranty and access to helpful customer support for compatibility questions or installation guidance. This support can assist with model matching and troubleshooting to ensure you get the most from the replacement parts.