Choosing the right heater limit switch ensures safety and reliable shutoff when temperatures climb too high. Below is a quick comparison of top replacement switches for RV water heaters, furnaces, and pool/spa heaters to help you match form, function, and compatibility.
| Product | Type | Key Compatibility |
|---|---|---|
| 232306 Thermostat Water Heater Limit Switch Kit | RV Water Heater Limit Switch | Suburban SW Series |
| L350 Limit Switch (2pcs) | Furnace Temperature Limit | Rheem Furnace 47-22861-01 |
| 006725F Auto Reset 135°F High Limit | Pool Heater High Limit (Auto Reset) | Raypak Models (various) |
| 42001-0063S High Limit Switch (Funmit) | Pool/Spa Heater High Limit | Pentair Sta‑Rite / MasterTemp / Max‑E‑Therm |
| 31091 190°F High Temp Limit Switch | RV Furnace High Limit | Atwood / Hydro Flame / Dometic Furnaces |
232306 Thermostat Water Heater Limit Switch Kit
This kit is listed as a replacement for part numbers 232306, 232282, 233534, 525007 and is specified for Suburban RV water heater SW series. The unit supports both 120VAC and 12VDC parameters and is constructed from high temperature resistant plastic and metal for improved conductivity and corrosion resistance. Use cases include restoring thermostat cutoff for gas/electric RV water heaters.
When evaluating this switch, verify exact part numbers and terminal layout against your OEM unit. The materials claim high-temperature tolerance, which is important for water heater environments, but confirm mounting points and electrical ratings match your heater before installation.
L350 Limit Switch Replacement (2pcs)
This pack contains two L350 limit switches sized to fit Rheem furnace model reference 47-22861-01. The central element is made of ceramic, offering thermal resistance up to 300°C (572°F), and the shell provides electrical insulation. Designed for furnace temperature control, the product is marketed for repair and replacement use.
For compatibility, check physical dimensions and mounting style against your existing limiter. Ceramic insulators are beneficial for high-temperature durability. Installation requires standard furnace safety practices such as power isolation and confirmation of proper wiring connections.
006725F Auto Reset 135F High Limit Thermostat
This auto-reset high limit thermostat is specified at 135°F and lists compatibility with many Raypak pool heater models (e.g., 185A, 206A, 265A series). As an auto-reset device, it will reopen the circuit automatically when temperature falls below its reset threshold, reducing the need for manual reset after an over-temperature event.
Auto-reset switches are useful where momentary over-temp shutdowns are expected and manual intervention is undesirable. Confirm model fit for your Raypak serial and check the mounting and lead style. Also verify the operating temperature rating is appropriate for the heater application.
42001-0063S High Limit Switch Replacement
This replacement switch is listed as a direct fit for Pentair Sta‑Rite, MasterTemp, and Max‑E‑Therm pool and spa heaters. It functions as a 135°F high limit to detect unsafe water temperatures and interrupt the heat exchanger control circuit. The listing references multiple OEM part numbers such as 42001-0063S and related replacements.
Because pool and spa heater electronics are exposed to humid environments, corrosion-resistant construction is an important factor. Confirm the exact Pentair model and part number match before ordering. Installation generally requires turning off power and following manufacturer wiring diagrams to avoid damage.
31091 190°F High Temp Limit Switch
The 31091 is a 190°F high temperature limit switch intended for RV furnace systems and lists compatibility with Atwood, Hydro Flame, and Dometic furnace part families. It’s described as constructed from wear-resistant materials for longer life and is intended to provide reliable over-temperature cutout protection.
Higher trip temperatures like 190°F are typical for furnace limit applications. Verify that the trip temperature, mounting style, and terminal configuration align with your furnace’s original limit to ensure proper protection and operation.
Buying Guide: How To Choose A Heater Limit Switch
Selecting the right limit switch requires attention to several technical and practical points. Below are key considerations and comparison perspectives to help match the switch to your heater system.
Compatibility And Part Number Matching
- OEM Part Numbers: Always cross‑reference the original part number. Exact part numbers and alternative numbers listed by the seller should match the unit you are replacing.
- Model Fit: Ensure the switch is specified for your heater brand and model family (e.g., Suburban SW, Pentair MasterTemp, Raypak series, Rheem furnace).
Temperature Rating And Function
- Trip Temperature: Choose a switch with the correct cut-off temperature for the application (pool spa ~135°F common; furnaces and RV furnaces often have higher ratings).
- Auto‑Reset vs Manual Reset: Auto-reset switches close automatically after cooling; manual reset requires human intervention after a fault. Pick based on safety policy and convenience needs.
Electrical And Mechanical Fit
- Voltage And Current Ratings: Confirm the switch electrical ratings (AC/DC, voltage, and current capacity) match your heater’s control circuit.
- Terminal Type And Layout: Spade, screw, or solder terminals should match wiring harness or connectors used in your unit.
- Mounting And Dimensions: Physical mounting point alignment is critical; check whether the replacement matches bracket holes and probe/standoff orientation.
Material, Durability, And Environment
- High‑Temperature Materials: Ceramic or high-temp plastics resist thermal degradation better than cheaper materials in furnace or water heater applications.
- Corrosion Resistance: For pool/spa heater parts, choose corrosion-resistant finishes or stainless components to extend service life in humid environments.
Safety And Regulatory Considerations
- Certified Components: When possible, select components that meet applicable safety standards for HVAC and pool heater industry norms.
- Proper Installation: Limit switches are safety devices. Follow manufacturer wiring diagrams, isolate power before service, and verify the unit functions after installation.
Practical Comparison Perspectives
- Replacement Accuracy: OEM or direct-fit replacements minimize fitment surprises; multi-part kits may require minor wiring adjustments.
- Long‑Term Reliability: Ceramic internals and corrosion-resistant housings typically offer longer life under repeated thermal cycling.
- Serviceability: Auto-reset switches reduce service calls for transient trips; manual reset switches may be preferred where a visible manual intervention is required for safety checks.
- Cost vs Longevity: While not discussing specific prices, weigh seller quality claims and warranty/support against expected lifespan for each environment type.
When replacing a limit switch, double-check all identifications, disconnect power, and follow safe electrical practices. If you are unsure about compatibility or safe installation, consult a qualified service technician or the heater manufacturer’s parts manual.