Winterizing RPZs for Pool Builders: Preventing Freeze Damage
Reduced Pressure Zone (RPZ) backflow preventers are critical for protecting water systems, but they are highly vulnerable to freeze damage in cold temperatures. A single overnight freeze can lead to cracked housings, costly replacements, and pool shutdowns. Pool builders must take proactive steps to protect RPZ assemblies and avoid unnecessary repairs.
1. Why RPZ Backflow Preventers Are at High Risk in Cold Weather
🚩 RPZ assemblies hold water inside, making them prone to freezing
🚩 Unlike underground plumbing, RPZs are typically above ground, exposing them to harsh temperatures
🚩 Even a partial freeze can crack valves and internal components, requiring full unit replacement
🚩 Failed RPZs can shut down pool operations until repairs or replacements are made
2. The Best Ways to Winterize an RPZ
✅ Drain the RPZ completely – Open test cocks and shut-off valves to release all water
✅ Remove & store the RPZ indoors if applicable and if the system is shut down for the season
✅ Install an insulated RPZ cover to protect against sudden temperature drops
✅ Use heat tape or a low-wattage heating element for added freeze protection
✅ Ensure proper drainage to prevent standing water inside the unit
3. When to Use an RPZ Insulation Cover vs. Full Removal
📌 Use an RPZ insulation cover if:
The pool system remains active during winter, and water continues to flow
The RPZ is in a location with some protection from wind and extreme cold
You need a fast and simple way to minimize freezing risk
📌 Fully remove and store the RPZ if:
The homeowner is comfortable/confident doing this without damaging the RPZ
The pool is fully shut down for the winter
The area regularly experiences below-freezing temperatures
The RPZ is installed in a completely exposed area with no wind protection
4. How Pool Builders Can Prevent Costly RPZ Repairs
🚧 Educate homeowners on winterization steps to prevent damage
🚧 Schedule fall maintenance checks to verify RPZ protection measures
🚧 Ensure RPZ installations include proper drainage to avoid standing water
🚧 Use only insulated or freeze-resistant RPZ enclosures in cold climates
RPZ Winterization Checklist
✅ Drain all water from the RPZ before freezing temperatures hit
✅ Shut off water supply and open test cocks to release trapped water
✅ Install an insulated RPZ cover or apply heat tape where necessary
✅ Remove and store RPZs indoors if shutting down the system for winter
✅ Confirm proper drainage to prevent standing water
✅ Schedule an inspection before winter to ensure the RPZ is ready
✅ Work with a licensed plumber to ensure compliance with winterization best practices
Need expert RPZ winterization services? Contact Wildflower Plumbing & Gas at (512) 292-1966 or email info@wildflowerplumbing.com for professional assistance!