Raypak 003346F Mechanical Thermostat Temperature Control Kit (Pool / Electric Spa) – 66°F to 106°F
The Raypak 003346F is a replacement mechanical thermostat temperature control kit used on many Raypak pool heaters (including millivolt/mechanical control models) and select Raypak electric spa/heater applications. It provides adjustable water temperature control and is commonly replaced when the heater won’t regulate temperature correctly, won’t maintain a setpoint, or the control becomes worn or unreliable.
Key Features
- Part Number: 003346F
- Type: Mechanical thermostat / temperature control kit
- Control Range: 66°F to 106°F
- Function: Regulates heater water temperature based on the thermostat setting
- Application: Commonly used on Raypak mechanical thermostat heater controls (varies by model and revision)
Common Compatible Heater Families (Verify by Model/Serial)
- Raypak 53 / 53A / 53B
- Raypak 055A / 055B
- Raypak 105A / 105B
- Raypak 130, 151, 153, and other legacy mechanical-control families
- Frequently referenced for mechanical-thermostat versions of Raypak pool heaters across multiple size ranges (confirm exact fit)
What’s Included
- Mechanical thermostat control
- Temperature sensing bulb/capillary assembly (as supplied with the kit)
Common Symptoms This Part Can Help Fix
- Temperature won’t adjust or won’t hold the selected setting
- Heater cycles inconsistently relative to the thermostat dial
- Thermostat knob feels loose, damaged, or the control is physically worn
- Unreliable heat regulation after confirming proper water flow and clean filtration
Installation Notes
- Shut off power and gas (if applicable) before servicing the control area.
- Route the capillary/sensing bulb carefully—do not kink, crush, or sharply bend the line.
- Install the sensing bulb fully into its well/holder per the heater’s design for accurate temperature control.
- If the heater still won’t regulate temperature after replacement, inspect water flow, bypass components, and other safety controls.
Related Products
- Search: Raypak 003346F
- Search: Raypak Thermostats
- Search: Raypak Sensor Wells / Adapters
- Search: Raypak High Limit Switches
- Search: Raypak Pressure Switches
- Search: Raypak Heater Parts
- Shop: Raypak
Installation & Maintenance Tips
- Keep filters clean and verify proper circulation flow—low flow can cause unstable heating behavior and nuisance shutdowns.
- Maintain balanced water chemistry (especially pH and calcium hardness) to reduce scaling that can affect heater performance.
- When servicing controls, keep the control compartment dry and inspect wiring/terminals for corrosion or looseness.
- If temperature control seems inaccurate, confirm the sensing bulb is seated correctly in its well and not damaged or kinked.
