If you’re shopping for an auto changeover propane regulator for an RV, you want dependable two‑tank switching that keeps the gas flowing when a tank runs dry. The top picks below are designed for dual‑tank setups, with indicators, quick‑disconnect options, and robust materials. They’re suited for RV owners, campers, and trailer travelers who need uninterrupted propane at outdoor sites or during cold mornings. The table after the intro highlights the key choices to compare side by side.
Product Comparison Table
| Product | Best For | BTU Capacity | Inlets / Outlet | |
|---|---|---|---|---|
| Flame King KT12ACR-2 | Dual‑tank RV setups with pigtails | 345,200 BTU | Inlets 1/4″ SAE inverted flare; Outlet 3/8″ NPT | Includes two 12″ pigtails |
| Flame King KT12ACR-2a | Same as KT12ACR-2 with updated model | 345,200 BTU | Inlets 1/4″ SAE inverted flare; Outlet 3/8″ NPT | Includes two 12″ pigtails |
| RecPro RV 2‑Stage Auto Changeover | Lightweight, portable RV setups | Up to 250 PSI working pressure | Inlets 1/4″ female NPT; Outlet 3/8″ female NPT | Includes hoses and light weight design |
| Flame King ACR‑2a | Dual‑tank RVs without pigtails | 345,200 BTU | Inlets 1/4″ SAE inverted flare; Outlet 3/8″ NPT | Without pigtails |
| Flame King KT18ACR‑2 | Mid‑range dual‑tank RVs with longer pigtails | 345,200 BTU | Inlets 1/4″ SAE inverted flare; Outlet 3/8″ NPT | Includes two 18″ pigtails |
Flame King KT12ACR-2: 2‑Stage Auto Changeover With 12″ Pigtails
The Flame King KT12ACR-2 is a UL Listed two‑stage auto changeover regulator designed for RVs with dual tanks. It automatically switches from the primary to the reserve tank when the main tank empties, ensuring continuous propane flow. It includes two 12‑inch pigtails for quick installation and a direct connection to standard valves. Best for RVers who want a ready‑to‑use dual‑tank system without extra adapters. Note that the 12″ pigtails simplify mounting but longer hoses may be needed on larger rigs in some layouts.
Flame King KT12ACR-2a: Updated 2‑Stage Auto Changeover
The KT12ACR-2a mirrors the KT12ACR-2 with minor updates for compatibility with RV dual‑tank setups. It automatically toggles to the full tank, remains UL Listed, and uses 1/4″ SAE inverted flare inlets with a 3/8″ NPT outlet. This model is best for owners who need reliable changeover with the same 12″ pigtail configuration as the previous version. A limitation is that it relies on standard tank fittings; verify your tank connectors before purchase.
RecPro RV 2‑Stage Auto Changeover Regulator
RecPro’s regulator is designed for easy life on the road, using an automatic switch to the full tank and a red indicator window to show when a tank is empty. It is lightweight at about 2.5 pounds and includes pigtails. It supports up to 250 PSI working pressure and uses 1/4″ female NPT inlets and a 3/8″ female NPT outlet with QCC1 hoses that incorporate a flow limiter and check valve. Choose this if you want a compact, portable option for camping or backyard setups. A caveat is the slightly lower maximum working pressure compared to some two‑stage units.
Flame King ACR‑2a: Dual Tank Auto Changeover (Without Pigtails)
The ACR‑2a offers a robust two‑stage changeover for RVs with a dual‑tank system, automatically switching from primary to reserve when needed. It uses 1/4″ SAE inverted flare inlets and a 3/8″ NPT outlet, rated at 345,200 BTU. This variant is best for RVers who already have a mounting arrangement for the regulator and want a reliable, no‑frills auto switch. A potential limitation is the absence of included pigtails, which may require separate purchase if your setup needs longer reach or different routing.
Flame King KT18ACR‑2: 2‑Stage Auto Changeover With 18″ Pigtails
The KT18ACR‑2 expands the same dual‑tank auto changeover concept with longer 18″ pigtails for easier reach in larger RVs or where tanks are spaced farther apart. It delivers up to 345,200 BTU and uses 1/4″ SAE inverted flare inlets with a 3/8″ NPT outlet. Best for owners who need longer hose reach without sacrificing changeover reliability. A limitation is the longer hoses may add a bit more length to the installation area, so plan mounting accordingly.
Buying Guide
What to consider when choosing an auto changeover regulator
- Tank configuration: Do you have two tanks in parallel, and how close are they to the regulator? Models with longer pigtails provide more flexibility.
- BTU and pressure: Look for a unit rated around 345,000 BTU or higher and a steady 11″ water column output for reliable appliance performance.
- Inlet/outlet fittings: Most RV regulators use 1/4″ SAE inverted flare inlets and 3/8″ NPT outlets. Verify compatibility with your hoses and tanks.
- Pigtails included: Some models include 12″ or 18″ pigtails; others require separate purchase. Decide based on your mounting setup.
- Indicators and safety: Red/green indicators or similar features help verify tank status. Ensure the unit is UL listed for safety.
- Weight and portability: Lighter regulators are easier to handle during installation or reconfiguration.
Best practice tips
- Check for proper seals and connections before use to prevent gas leaks.
- When upgrading, pair a regulator with compatible hoses and mounting hardware designed for RV use.
- Test the system with a propane leak detector or soapy water after installation to confirm a safe setup.
Who should consider each option
- KT12ACR‑2 / KT12ACR‑2a: Ideal for dual‑tank RVs that can benefit from included 12″ pigtails and automatic switching.
- RecPro RV 2‑Stage: Suitable for portable use and lighter rigs; good balance of features and weight.
- ACR‑2a (without pigtails): Best if you already have a mounting plan and just need a reliable auto switch.
- KT18ACR‑2: Best for larger RVs needing longer pigtails and flexible hose routing.
Frequently asked questions
- Why use an auto changeover regulator? It automatically maintains gas flow by switching to the full tank, preventing interruption in appliances.
- What does BTU rating indicate? It reflects the regulator’s maximum gas flow capability; higher BTU means it can support more or larger appliances.
- Are these regulators safe for cold weather? Most models are designed for cold weather operation, but check the product specs for any limits.
- Do I need pigtails with my regulator? Some models include pigtails; others require you to buy separately. Measure your setup first.
- Will these regulators fit standard RV hoses? Inlets are typically 1/4″ SAE inverted flare and outlets 3/8″ NPT; confirm compatibility with your hoses and tanks.
- How do I know which model to choose? Consider tank layout, required hose length, and whether you value included pigtails, weight, and ease of installation.