PrecisionTemp RV550 Water Heater Installation Guide - Complete RV500 Replacement Tips

Quick Take

Yes, the flex hoses on your RV550 replacement should provide enough length to pull the unit partially out of the compartment for connection access, but you'll need proper support since these units weigh around 50-60 pounds (verify exact weight for your specific model). The RV550 is indeed designed as a direct replacement for your RV500 in your 2013 Phaeton, but the "like for like" swap still requires careful handling of the gas and water connections. Plan on having the unit extend about 12-18 inches from the compartment opening when fully pulled out on the flex lines.

Common Causes

The main challenges with this replacement commonly include compatibility issues, but more often involve the physical handling during the swap. The flex hoses are typically 18-24 inches long, which gives you working room but creates a cantilever situation where the water heater wants to tip forward. Most DIYers underestimate the weight distribution when the unit is pulled out - the control panel and combustion chamber make it front-heavy.

Another common issue is not having the right support system ready before starting. Many people try to hold the unit with one hand while working connections with the other, which leads to dropped connections, scratched compartments, or worse - a dropped water heater. The gas connection especially requires two-handed attention for proper thread engagement.

Some owners also run into clearance issues if their Phaeton has aftermarket modifications or if previous service work changed the original routing of utilities. The 2013 Phaeton should have standard clearances, but it's worth checking before you start pulling things apart.

Preparation

SAFETY WARNING: Before touching anything, turn off your LP gas at the tank, disconnect all electrical connections to the water heater, shut off the water supply to the unit, and shut off the water pump. If the unit was recently operating, allow it to cool completely before handling. Ensure no electrical power is present before beginning any work.

Drain the old RV500 completely by opening the pressure relief valve and drain plug. You'll need a 1-1/16" socket for the drain plug and basic hand tools for the gas and water connections. Have a small bucket ready for residual water that will spill when you disconnect the lines.

Create a support system before you start pulling the unit out. A simple solution is to position a sturdy milk crate or tool box directly below where the water heater will hang when extended. Some owners fashion a support arm using a 2x4 and C-clamp attached to the compartment frame. The key is having something that supports the unit at chest height so you can work comfortably on the connections.

Gather your tools: pipe dope or Teflon tape for gas connections, two adjustable wrenches, possibly a pipe wrench for stubborn fittings, and good lighting. Have your phone ready to take pictures of the existing connections before you disconnect anything - this helps tremendously during reassembly.

Check that you have clear access to work around the compartment. Remove any items stored nearby and ensure you can kneel or sit comfortably while working. This job typically takes 2-3 hours if everything goes smoothly, so comfort matters.

Repair Steps

SAFETY WARNING: Ensure LP gas is shut off at the tank and all electrical connections are disconnected before beginning removal.

Start by taking detailed photos of all connections before disconnecting anything. Disconnect the water lines first, then the gas line - gas disconnection requires two wrenches to avoid twisting the flex hose fitting. The gas connection should break free with moderate pressure, but if it's really stuck, penetrating oil applied 15-20 minutes earlier helps.

Next, disconnect the cold water inlet and hot water outlet. These are typically 3/4" NPT fittings that may have some residual pressure, so have your bucket ready. The water connections usually come apart easier than gas, but older fittings can be stubborn. Work slowly to avoid cross-threading or damaging the flex hose fittings.

With connections free, carefully slide the old RV500 out while your support system takes the weight. The unit should slide on the mounting brackets built into the compartment. Remove the old unit completely and set it aside safely - it makes a good core for warranty exchange if applicable.

Before installing the RV550, compare the mounting hole patterns and connection locations with your photos. The units should be identical, but verify electrical connection compatibility and double-check all mounting points. Slide the new RV550 into position on the rails, ensuring it's properly seated and maintaining proper ventilation and combustion air clearances before making any connections. Connect water lines first (easier to handle), then the gas line last. Use fresh pipe dope on all gas threads and check your work twice. Torque all connections to manufacturer specifications. Test for leaks using soapy water on all gas connections before pushing the unit back into the compartment.

When to Get Help

Call a professional if you encounter any gas line modifications needed beyond simple reconnection. If the existing gas flex line shows any signs of damage, cracking, or won't seal properly with normal tightening, stop and get help. Gas work isn't worth the risk if you're not completely confident.

Also seek help if the water connections require replumbing or if you discover the mounting configuration doesn't match between your RV500 and RV550. While they're supposed to be direct replacements, occasionally production changes create compatibility issues that require modification.

If you're struggling with the physical aspects - the unit feels too heavy, you can't get good leverage, or you're working alone - consider getting an assistant rather than risking injury or damage. These water heaters are expensive, and a helper makes the job much safer and easier. The RV550 represents a straightforward upgrade from the RV500, with similar mounting requirements but potentially improved efficiency ratings that make the replacement worthwhile for long-term RV use. Always follow manufacturer specifications for final installation verification.