Winter RV Storage Heating: Complete Guide to Using Portable Propane Tanks for Freeze Protection

Quick Take

Your winter propane setup for the Integra Ethos using a conventional 20lb grill bottle with the Truma Combi Comfort Plus is a clever approach that many RVers use successfully. The parts list you've assembled - the brass flare coupling, quick connect fittings, and regulated hose with gauge - creates a proper connection that maintains the proper water column pressure your Truma system needs (typically 11 inches water column for Truma Combi Comfort Plus - verify with manufacturer specifications). However, there are critical safety considerations with this setup that require careful attention to prevent potentially dangerous situations like gas leaks or pressure irregularities that could damage your heating system.

SAFETY WARNING: This modification involves permanent changes to your RV's propane system. Consult a certified RV propane technician or qualified professional before proceeding with any propane system modifications to ensure compliance with safety codes and proper installation.

Your approach of setting the internal temperature to 40°F and using both gas and electric heating modes is smart for maintaining standby temperatures while minimizing propane consumption. The heating capability combined with the electric heaters gives you excellent flexibility for winter storage heating, especially when you can supplement with electric power to reduce propane usage.

Common Causes

Common reasons RVers avoid this type of setup include safety concerns and potential code violations. Most RV manufacturers and insurance companies discourage permanent modifications to propane systems because improper connections can create leak points that weren't part of the original system design. The quick-connect fittings, while convenient, can sometimes develop leaks over time, especially in cold weather when seals contract.

Another common issue is pressure regulation problems. Your Truma Combi Comfort Plus is designed to work with the RV's main propane system at specific pressures. External regulators sometimes don't maintain consistent pressure during temperature fluctuations, which can cause the heating system to cycle improperly or shut down on safety lockouts. Additionally, some areas have codes that prohibit permanent propane connections that bypass the RV's original safety systems.

Many RVers also underestimate propane consumption during extended winter use. Even at 40°F, your system will cycle regularly during cold snaps, and a 20lb bottle may not last as long as expected, potentially leaving you without heat during the coldest periods.

Preparation

Before implementing this system, verify your local codes and insurance requirements regarding modified propane systems. Some jurisdictions require permits for permanent propane connections, and some insurance policies may be voided by non-standard installations. Document your setup with photos and keep receipts for all components in case you need to prove the quality of materials used.

SAFETY WARNING: Test all connections thoroughly using leak detection solution before relying on the system. Apply leak detection solution to all fittings and observe for 5 minutes minimum to detect any bubbling that indicates leaks. Never use an open flame to test for gas leaks.

This is especially important with the brass flare coupling and quick-connect fittings, as these are the most likely failure points. Check connections again after the first few days of operation and periodically throughout the winter, as thermal cycling can loosen fittings.

Set up a monitoring routine for your 20lb bottle consumption. Calculate expected usage based on your heating needs and outdoor temperatures, and establish a refill schedule that ensures you won't run out during cold periods. Consider having a backup bottle ready for quick changeover. Also, ensure you have a clear path for bottle changes that doesn't require you to enter areas where gas could accumulate.

Install additional propane detectors if your RV doesn't already have them in areas where the external connection is made. These battery-powered units can provide early warning of leaks that might develop in your external plumbing.

Repair Steps

SAFETY WARNING: Ensure all propane appliances are off and the area is well-ventilated before beginning work. Have a propane leak detector solution and fire extinguisher readily available.

Start by shutting off your main RV propane tanks completely and ensuring all propane appliances are off. Install the brass flare coupling to your RV's external propane connection. Tighten to manufacturer specifications - over-tightening can damage the threads or create stress points that lead to leaks.

Connect the quick-connect fitting assembly, ensuring the 3/8" flare connections are properly seated. These connections should be torqued to manufacturer specifications (see manufacturer specifications for 3/8" propane flare fittings). Connect your regulated hose to the 20lb bottle, making sure the Type 1/QCC1 connection is fully engaged - you should hear it click into place securely.

Before opening any valves, double-check that your Truma system is set to the correct heating mode and temperature. Slowly open the 20lb bottle valve fully, then check that the system operates properly (the regulator should provide approximately 11 inches water column pressure - verify manufacturer specifications for your specific system).

Test the entire system by starting your Truma heating system and confirming it ignites properly and maintains temperature. Monitor the system for the first few hours of operation, checking all connection points for leaks using leak detection solution and ensuring the heating system cycles normally. Keep detailed records of bottle usage and system performance for future reference.

When to Get Help

SAFETY WARNING: Call a certified RV propane technician immediately if you detect any gas odor around your connections or if your Truma system begins displaying error codes or failing to maintain proper operation.

These symptoms often indicate pressure regulation problems or leak issues that require professional diagnosis and repair.

If your heating system starts short-cycling, fails to ignite consistently, or you notice unusual flame patterns (if visible), stop using the external setup immediately and revert to your main tanks until a professional can evaluate the system. These issues can indicate improper pressure regulation that could damage expensive heating system components.

Consider professional consultation before implementing this setup if you're not completely comfortable with propane systems or if your RV is still under warranty. Many manufacturers void heating system warranties for modifications to propane supply systems, so documenting professional approval of your setup could be valuable for future warranty claims.