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Every Buddy model ships ready to run on 1 lb disposable cylinders. The single most common upgrade long-term owners make is adding a hose-and-filter kit to connect to a refillable tank instead. Here is what that upgrade actually involves.
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Why Upgrade From Disposable Cylinders
Disposable 1 lb cylinders are convenient for occasional or backpacking use. But the fuel cost per hour is meaningfully higher than filling from a refillable 20 lb tank. Running through several cylinders a night on a Big Buddy adds up fast for regular use. A hose-and-filter kit connects the heater to a standard grill-size 20 lb tank, or larger. That extends run time dramatically on a single fill.
The Official Mr. Heater Filter Kit
Mr. Heater sells its own hose-and-filter assembly for the Buddy series, part number F276163. It includes an inline fuel filter. The company’s own documentation recommends this filtered kit over a generic hose. The filter keeps debris from a refillable tank away from the heater’s regulator. Using the official kit costs a little more than a plain hose. It is worth it, since an unfiltered connection can expose the heater to contaminants a sealed disposable cylinder never would.
Which Models Can Hose-Connect
The standard Buddy, Big Buddy, Hunting Buddy, and Buddy FLEX can all connect to a refillable tank with the right kit. The Little Buddy cannot. It is designed for 1 lb disposable cylinders only. If you want tank-connected run time in the Little Buddy’s size class, the standard Buddy is the next model up that supports it.
Standard Hose Length and When to Go Longer
The stock hose on most kits keeps the tank close to the heater. That works fine for a garage or a small tent, where the tank sits within a few feet. For a larger wall tent or a job trailer, you may want the tank farther away for stability or ventilation. A longer hose extension, commonly sold in 10 to 18 foot lengths, gives that flexibility. A longer run does add a small amount of pressure drop. At Buddy-series output levels, this is rarely noticeable.
Connecting to the Tank: Step by Step
- Confirm the tank has a working OPD (overfill protection device) valve. Nearly all consumer 20 lb tanks sold today have one.
- Thread the hose’s tank-end fitting onto the tank valve by hand until snug. Add a small extra turn with a wrench only if the fitting calls for one.
- Connect the heater-end fitting to the heater’s inlet the same way: hand-tight, then a small turn.
- Open the tank valve slowly. Check every connection with a soapy-water test. Bubbling means a leak. Re-seat that fitting before lighting.
- Once the connection tests leak-free, follow the standard lighting sequence.
Keeping the Tank Stable and Upright
A hose-connected 20 lb tank needs to sit upright and stable. This matters most in a tent or blind, where uneven ground or tight floor space raises the risk of tipping. A dedicated propane tank stand or dolly keeps the tank secured and off bare ground. It also helps protect the valve assembly from impact during setup and transport.
Storing a Hose-Connect Kit Between Uses
Disconnect the hose from both the tank and the heater before long-term storage. Coil the hose loosely. A sharp kink can stress the fitting connections over repeated storage cycles. Inspect the hose for cracking or wear at the start of each season before reconnecting. A degraded hose is one of the more common sources of a leak found during the soapy-water test.
Carrying Cases: Protecting the Heater Itself
Several Buddy models have a purpose-built carry case or bag, separate from the fuel hose itself. There is a padded case for the Big Buddy and a simpler carry bag for the standard Buddy. Both protect the unit during transport and storage between seasons. These are worth adding if you move the heater often by vehicle or on foot. The radiant element and control valve are the parts most at risk from impact in an unprotected bag or a loose spot in a truck bed.
Choosing a Tank Stand for Your Setup
A basic dolly-style stand with wheels works well for a garage or driveway, where you may move the tank between spots. A simpler fixed stand or base is often enough for a tent or blind that stays in one place for the trip. Either option beats setting a tall cylinder directly on uneven ground, where a light bump can send it over and put stress on the hose connection.
Adapting Older Hose Fittings
Some older hose kits use a POL-style fitting instead of the newer QCC1 "hand-tight" style found on most tanks sold today. A simple brass adapter bridges the two, and most hardware stores carry one. If a hose you already own will not thread onto a newer tank, check the fitting type before assuming the hose itself is faulty.
Common Connection Mistakes
The most common issue after adding a hose-and-filter kit is a fitting that was not fully seated before the soapy-water test. This produces a slow leak that only shows up under pressure. Cross-threading, from forcing a fitting instead of starting the thread by hand, is the usual cause. Take the extra thirty seconds to start every fitting by hand before using a wrench.
Is the Upgrade Worth It for Occasional Use?
For a heater used only a handful of times a year, disposable 1 lb cylinders are the simpler option. There is no hose to store, no tank to keep filled, and no connection to inspect each season. The hose-and-filter upgrade pays off fastest for anyone running a Buddy heater regularly through a full winter. The fuel-cost savings add up quickly compared to buying cylinders one at a time.
The Bottom Line
If you use a Buddy heater more than occasionally, the official Mr. Heater filter kit on a 20 lb tank is a straightforward upgrade. It cuts ongoing fuel cost and extends run time well beyond what disposable cylinders offer. Pair it with a stable tank stand and a soapy-water leak check on every setup. That combination adds real convenience with minimal added risk.
Checking Your Kit Before Every Season
A hose-and-filter kit stored over the off-season should get a quick check before its first use each winter. Flex the hose gently and look for cracking near the fittings. Check the filter housing for any visible debris or discoloration. Replace the inline filter itself on the schedule the manufacturer’s documentation recommends, rather than waiting until performance noticeably drops. A few minutes of inspection each season is cheap insurance against a mid-trip failure.
Buying a Second Kit for a Backup Heater
Owners running more than one Buddy model, a standard Buddy in the garage and a Little Buddy for tent trips, for example, sometimes keep a second hose kit rather than swapping one back and forth. This costs a little more up front but saves the hassle of disconnecting and reconnecting between uses, and it means both heaters are ready to go without extra setup time when you need them.