Rinnai FC510P Propane Heater Review: Warms 285.7 Square Feet With Floor-Mounted Ventless Heat

What the FC510P Is, and Who For

Rinnai FC510P Propane Heater heats 285.7 square feet for you if you need a floor-mounted indoor propane heater for a 285.7-square-foot space.

If your space needs a floor-mounted heater, the 3-inch depth matters because shallow clearance can decide whether the unit belongs there at all.

Rinnai FC510P fits that kind of setup with a 3″D x 23″W x 20″H cabinet and floor mounting. The listing also names propane fuel, 285.7 square feet of heating coverage, and a steel material. Safety features include an oxygen depletion sensor, overheat protection, a tip-over switch, and a flame failure device. Around $1,322.37 and a 4.3 average from 408 buyer ratings give extra context.

We screened 31 Propane Heaters and this is one of 15 chosen for a full review. Full reviews go to the most-rated products that pass screening, at most 2 per brand. FC510P had 408 buyer ratings, the fourth most of the 31 screened. This review is for you if you need a floor-mounted propane heater and are checking whether its 3-inch depth fits your space.

If you need a compact option, our review of the PPH04 covers its performance as a portable unit.

The Short Answer on the FC510P

Best for: You need a floor-mounted propane heater for a 285.7-square-foot space and want thermostat control in the same unit.

FC510P is a reasonable pick for that setup, and it costs around $1,322.37.

• Pro: The 285.7-square-foot coverage gives you a clear room-size target before you order.
• Pro: The 23-inch width helps if your placement area is tight side to side.
• Pro: Thermostat control, oxygen depletion sensor, and tip-over protection all appear in the listing.
• Con: The 23-inch cabinet can rule out narrow floor spaces, so measure your available width first.
• Con: The 4.3 average from 408 ratings is useful context, but it does not add heating capacity or coverage.

Don’t buy this if: you need a heater for more than 285.7 square feet.

Price assessment: $1,322.37 is a premium price for this coverage and feature set.

The Numbers on the Spec Sheet

Coverage area most separates the FC510P from other propane heater options here. It measures the floor area the heater is intended to warm.

Before You Buy: Propane Heater Checklist

The first thing to check is whether your space can take a 23-inch-wide floor unit and still leave clearance around it. If the opening is tighter than that, you will need a different heater or a different location.

• ☐ Confirm the width allowance — 23″ W. If the space is narrower, the heater will not fit where you planned and you may have to return it or redesign the placement.
• ☐ Check that you want a ventless indoor heater — ventless design. If your room needs outside exhaust or a chimney, this model is the wrong type and you will need another heater.
• ☐ Measure the room you want to heat — 285.7 square feet heating coverage. If your space is larger, you may end up with a unit that is undersized for the area and have to buy a different heater.
• ☐ Confirm you have propane fuel available — propane fuel type. If you do not plan for propane, the heater cannot do its job and you will be left with a unit you cannot use as intended.
• ☐ Check that the floor location suits the mounting type — floor mount. If you need wall mounting, you will have to choose another model or live with a placement that does not work for your room.
• ☐ Budget for a qualified installer if your local rules require one — indoor usage. If the installation rules for your area require professional handling, skipping that step can leave you with a heater you cannot put into service.

If you need a wall-mounted heater, or your room needs a vented setup, you should not buy this one.

Performance in Practical Terms

How 285.7 square feet of indoor room coverage helps

FC510P is rated for 285.7 square feet of heating coverage, so that size is the room scale this model is built to serve. For a room near that size, the figure gives you a direct buying target rather than a vague comfort claim.

The 23-inch width matters if your floor space is tight, because the heater occupies a fixed side-to-side footprint. 285.7 square feet is not a whole-house figure. It suits a single enclosed room, not a larger open plan area.

Which shutoff systems protect this Propane Heater indoors

FC510P states an oxygen depletion sensor, an overheat switch, a tilt switch, and automatic power/gas shut-off for overheating, overturning, or extinguishing. That set of shutoff features is the reason this model belongs in indoor propane heater comparisons, where carbon monoxide buildup and oxygen depletion shutdown nuisance both matter.

The same safety package also changes what you should plan around. The floor mount, cool-to-touch cabinet, and safety lock all point to a heater meant for indoor placement with less exposed surface risk, while the ventless design keeps the combustion heat in the room. Moisture and condensation still remain part of vent-free operation, so you need a space that can tolerate added humidity.

How thermostat and control features manage indoor warmth

FC510P includes thermostat control, a programmable thermostat display, digital adaptive control, and manual control, so you can set a room target instead of running only at one fixed output. That makes the heater more useful when you want steadier indoor warmth in a room that is close to its 285.7-square-foot rating.

The control set also gives you a fallback if you want simpler operation. Manual control keeps the heater usable without relying only on the display, while self-diagnostics and the flame failure device add status and shutdown functions that support indoor use. The trade-off is that the unit is still a floor-mounted propane heater, so you need space for a 23-inch-wide appliance and for the propane fuel type it uses.

Where the FC510P Sits Among the Alternatives

FC510P’s clearest edge is its floor-mounted format with 23 inches of width and 285.7 square feet of stated coverage. That combination makes it the more space-conscious choice among the larger indoor propane heaters here.

• Against Mr. Heater F299730 30000 BTU, FC510P is the more compact floor model, and its 285.7 square feet coverage is far smaller than the 1,000 square feet figure on that heater.
• Against Mr. Heater F299720 20000 BTU, FC510P is the only one of the pair that states a floor-mount design, while the Mr. Heater listing gives a 20,000 BTU/hr output instead of coverage area.
• Against Mr. Heater 400,000 BTU Propane Heater, FC510P is the indoor floor unit with 23-inch width, while that competitor is a much larger 400,000 BTU/hr heater built around a different scale.
• Against DEWALT DXH70CSFAVX 70000-BTU Heater, FC510P ranks lower on stated coverage area, since DEWALT lists 1,750 sq ft and FC510P lists 285.7 square feet.
• Across the six products here, FC510P is tied for the highest listed price at around $1,322.37, so price does not separate it from the Rinnai FC824P Vent Free.

If you want the most coverage per dollar, Mr. Heater F299730 30000 BTU is the better pick at around $265.39 and 1,000 square feet. FC510P makes more sense when you want a floor-mounted indoor propane heater and can live with its smaller 285.7 square feet rating.

You can also view our full review of the FC824P to see how it compares in performance.

For a different brand, see the complete FBDTP30 spec breakdown to see its heating capacity.

What It Takes to Run the FC510P

What FC510P needs before first use

Propane is the fuel source this FC510P needs before it can heat anything.

1. Set the heater on a floor location that leaves 23 inches of width and 3 inches of depth available.
2. Connect the propane hose to a propane cylinder that matches the fuel type.
3. Set the programmable thermostat display to the temperature you want the heater to hold.
4. Confirm the oxygen depletion sensor, overheat switch, and tilt switch are active before leaving the unit running.

Warranty and support checks for FC510P

Warranty cover differs by seller and country.

• Confirm the return window before it closes, because the FC510P uses a steel cabinet and floor-mount format that are not simple to replace if you change your mind.
• Confirm whether the seller covers a propane hose, because the heater needs one to connect a cylinder for operation.
• Confirm whether the seller covers a wall thermostat, because the programmable thermostat display suggests a remote control setup may matter to your use.
• Confirm how oxygen-depletion and tip-over protections are handled under support, because those safety parts are tied to indoor use and should not be left unresolved.

On the day it arrives, inspect the box for shipping damage and verify the 23-inch width while the return option is still open.

Questions Buyers Ask About This Propane Heater

How much propane does FC510P use, and what kind of runtime should I expect from a tank?

FC510P is a propane heater, but its propane burn rate is not stated. That leaves runtime unstated too, because tank life depends on how much fuel the heater consumes per hour and on the tank size you use.

For this kind of heater, runtime is a fuel-and-load question, not a width question. Measure the tank size you plan to use, then compare it with the missing burn-rate figure; here, that second figure is not provided, so you cannot estimate runtime from the listing alone.

Is the FC510P Right for You?

The FC510P suits 6 kinds of buyer and is the wrong choice for 5 jobs, listed below with the reason for each.

Where to Buy This Propane Heater

Propane heaters are sold by the retailers below – we do not track which of them has the FC510P in stock, so check availability and the current price with the retailer before making a trip.

• Ace Hardware (online and physical stores) — local-store convenience and in-store returns
• Walmart (online and physical stores) — broad mass-market selection and easy pickup options
• Amazon (online only) — breadth of range across many brands and models
• Home Depot (online and physical stores) — broad range of propane heaters and in-store returns
• Lowe’s (online and physical stores) — broad range of propane heaters and in-store returns
• Tractor Supply Co. (online and physical stores) — useful for rural-oriented heating gear and specialist staff
• Northern Tool + Equipment (online and physical stores) — breadth of range for jobsite and utility heaters

Final Verdict on the FC510P

You should choose the FC510P if you need a floor-mounted propane heater with 285.7 square feet of coverage and a 23-inch width. It is around $1,322.37.

The strongest number here is the 285.7 square feet heating coverage, because it defines the room size this heater is aimed at. The FC510P also lists a 4.3 average from 408 buyer ratings, plus thermostat control, an oxygen depletion sensor, overheat protection, and a tip-over switch.

Skip it if: you need to heat a much larger space, or you want a heater with a smaller footprint than 23 inches wide.