Single Element Thermostat For Electric Water Tank, 230033, 4000HL

Knox Company Single‑Element Water Heater Thermostat | OEM‑Compatible | MFG# 4000HL

Brand New – Knox Company Single‑Element Thermostat (Therm‑O‑Disc® New Style)

This high‑quality single‑element water heater thermostat replaces Therm‑O‑Disc® MFG# 4000HL and is designed for electric water heaters that use a single heating element. Featuring an adjustable 90°F–150°F temperature range and a built‑in 170°F high‑limit reset, this thermostat provides safe, reliable temperature control for residential water heaters.

Engineered with a temperature‑sensitive bimetal disc, it delivers instant ON/OFF switching and dependable performance under high electrical loads. Welded internal construction ensures long‑lasting electrical integrity, and the compact design fits major water heater brands.

⚙️ Product Features

• OEM‑compatible replacement for Therm‑O‑Disc® 4000HL
• For single‑element water heaters (120V)
• Adjustable temperature range: 90°F–150°F
• 170°F high‑limit manual reset for added safety
• Single‑throw design for simple, reliable operation
• Bimetal disc technology for fast, accurate switching
• Welded internal components for superior electrical durability
• Fits major brands including Whirlpool®, US Craftmaster®, American®, AO Smith®, GE®, Rheem®, Ruud®, Richmond®
• Condition: Brand New – Hang Bag Packaging

Fits Water Heater Brands

Whirlpool®, US Craftmaster®, American®, AO Smith®, General Electric®, Rheem®, Ruud®, Richmond®
Always verify compatibility with your specific model before purchase.

Common Fixes

• No hot water in single‑element systems
• Water overheating or tripping the high‑limit switch
• Thermostat stuck ON or OFF
• Inconsistent temperature control
• Breaker tripping due to thermostat failure

️ Installation Tips

• Turn off power at the breaker before servicing
• Remove access panel and insulation to reach thermostat
• Take a photo of wiring before disconnecting
• Ensure thermostat sits flush against tank surface for accurate sensing
• Adjust temperature only as needed (120°F recommended for safety and efficiency)
• Press the high‑limit reset button if the thermostat has tripped
• Restore power and test for consistent heating

Dependable, accurate, and built to last — this Knox Company single‑element thermostat delivers reliable temperature control for modern electric water heaters.