Every premium grill we sell is "stainless steel," and that phrase hides the single biggest durability decision a coastal homeowner makes. The grade of steel in the body, hood and burners decides whether a built-in grill on the South Shore still looks right in year eight or starts showing brown freckles in year two. Most of the grills in our Maspeth showroom are 304. A handful, led by the Blaze Marine Grade line, are 316 or 316L. A few budget lines use 430 or 443.
This guide explains the three grades in plain language, shows you the magnet test, walks through where each alloy lives on a grill, and tells you honestly when the 316 upgrade is worth paying for. We install across Long Island, the Jersey Shore and the Palm Beach to Stuart corridor, so salt air is not a theoretical problem for us.
The short answer
304 stainless (roughly 18 percent chromium, 8 percent nickel) is the right choice for most backyards and is what Fire Magic, Twin Eagles, Lynx, Hestan and standard Blaze grills are built from. 316 adds 2 to 3 percent molybdenum, which is what resists pitting from salt. If your grill sits within about a mile of open salt water, or you can taste salt on the wind, a 316 marine grade grill such as the Blaze Premium LTE+ Marine or Broilmaster B-Series Marine Grade is worth it. Everywhere else, buy 304, keep it covered and wash it, and it will outlast the rest of the outdoor kitchen. Avoid 430 and 443 bodies near the water; they are magnetic and the cheapest way to build a grill.
Key takeaways
- 304 and 316 are both austenitic and essentially non-magnetic. 430 and 443 are ferritic and grab a magnet. A fridge magnet in the showroom tells you which family you are looking at in two seconds.
- Molybdenum is the whole story. 316 carries 2 to 3 percent, 304 carries none, and that is why 316 resists chloride pitting and tea staining far better.
- Brown "tea staining" near the shore is surface corrosion, not structural rust. It is cosmetic, it is almost always excluded from warranties, and 316 plus regular washing is how you avoid it.
- The only true 316 grill heads we stock are the Blaze Premium LTE+ Marine (316L body and cast burners) and the Broilmaster B-Series Marine Grade (316 housing and cast burners). Everything else premium is 304.
- Warranties cover rust-through and defects, not discoloration or surface rust. Summerset goes further and puts coastal installs under "manufacturer review."
- A 316 grill in a 304 island of doors and drawers will outlast its surroundings. Blaze sells matching marine grade doors, drawers and flame tamers so the whole face of the island holds up together.
In this guide
- 304 vs. 316 vs. 430 at a glance
- What is actually different about 304, 316 and 430?
- Does the magnet test really work?
- Where is each grade used on a grill?
- What is tea staining, and is it rust?
- How close to salt water do you need 316?
- Which brands offer 316 or marine upgrades?
- Does the steel grade change the warranty?
- How do you care for stainless near the coast?
- Our recommended models
- Which should you choose?
- Frequently asked questions
304 vs. 316 vs. 430 at a glance
Composition figures below are the standard ranges published by the Australian Stainless Steel Development Association and AZoM for each UNS grade. Manufacturers do not publish mill certificates for grills, so treat the grade on the spec sheet as the claim you are buying.
| Grade | Chromium / nickel / molybdenum | Magnet | Salt air | Where you see it |
|---|---|---|---|---|
| 304 | 18 to 20% Cr, 8 to 10.5% Ni, no Mo | No pull (annealed) | Good with washing; will tea stain near surf | Fire Magic, Twin Eagles, Lynx, Hestan, Delta Heat, Blaze LTE+ and LUX, Summerset TRL Pro |
| 316 / 316L | 16 to 18% Cr, 10 to 14% Ni, 2 to 3% Mo | No pull | Best available in a grill; resists chloride pitting | Blaze Premium LTE+ Marine, Broilmaster B-Series Marine Grade, Blaze marine doors and drawers |
| 430 / 443 | 16 to 18% Cr, under 0.75% Ni, no Mo (430) | Strong pull | Weakest of the three; keep it inland | Entry-level carts and some value built-in bodies |
What is actually different about 304, 316 and 430?
Stainless steel resists rust because chromium forms a thin, self-healing oxide skin on the surface. All three grades have enough chromium to do that in dry, clean air. The differences show up when chlorides (salt) get involved.
304 is the workhorse. The "18/8" stamped on cutlery is 304: about 18 percent chromium and 8 percent nickel. The nickel makes it austenitic, which is why it is tough, easy to weld, and non-magnetic. The stainless trade group ASSDA describes 304 as resistant to potable water with up to about 200 mg per liter of chlorides at room temperature, and prone to pitting and crevice corrosion in warm chloride environments. Sea spray is thousands of mg per liter, so 304 near the surf is living on borrowed time unless it is washed.
316 starts from the same recipe and adds 2 to 3 percent molybdenum, with the nickel bumped up to 10 to 14 percent to keep the structure austenitic. Molybdenum is what resists pitting from chlorides. The same ASSDA reference lists 316 as tolerant of roughly 1,000 mg per liter of chlorides at room temperature, about five times the 304 figure. The "L" in 316L means low carbon, which keeps welds from losing corrosion resistance; Blaze specifies 316L for the Marine Grade LTE+. Even 316 is not immune: ASSDA notes it still pits in warm chloride environments and is not rated for warm seawater. It is the better grill steel, not a magic one.
430 and its cousin 443 are ferritic. They keep the chromium (16 to 18 percent) but drop the nickel to under 1 percent, which is why they cost less and why they stick to a magnet. AZoM rates 430's pitting and crevice resistance as "quite similar" to 304 on paper, but in practice 430 is used on thinner, cheaper panels, is harder to weld cleanly, and is where we see the first rust streaks on budget carts.
From our install team
In our showroom we keep a magnet on the desk. Customers are often surprised when a grill that is advertised as "stainless" grabs it on the side panels but not on the hood. Brands mix grades to hit a price, and the parts that get mixed are usually the ones you do not see until the island is built.
Does the magnet test really work?
Mostly. Austenitic grades (304, 316) have what the British Stainless Steel Association calls a "negligible" response to a hand magnet. Ferritic grades (430, 443) are ferromagnetic and pull hard. So a magnet that sticks firmly to a grill body tells you it is not 304 or 316.
Two caveats. ASSDA notes that cold-worked 304 can become noticeably magnetic, so a sharply bent corner or a stamped edge may show a faint tug even on a genuine 304 part. And the magnet cannot tell 304 from 316, because both are non-magnetic. For that distinction you rely on the manufacturer's spec sheet and the model number (Blaze adds "MG" to its marine grade SKUs, for example BLZ-4LTE3-MG).
Use the magnet to rule out cheap steel. Use the spec sheet to confirm 316.
Where is each grade used on a grill?
A grill is not one piece of steel. The parts live in different conditions, and brands spend their money where it matters to them.
- Body, hood and control panel. This is the face of the grill and the part that tea stains. Premium brands use 304 here; Blaze and Broilmaster offer 316 on their marine lines. Hoods are usually double-walled, which also helps the outer skin resist heat tint.
- Burners. Burners run hot and sit in grease, so corrosion resistance and thickness both matter. Fire Magic Echelon casts its E-burners from 304 with quarter-inch walls. Blaze LTE+ uses cast 304, and the Marine LTE+ casts them in 316L. Hestan uses 321 stainless for its Trellis tube burners, a heat-stabilized grade. Lynx Professional sidesteps the question with ceramic burners that cannot rust.
- Cooking grates. Almost always stainless rod, 8 to 12 mm thick. Grates are cleaned and heated constantly, so staining is rarely the issue; warping and burnt-on carbon are.
- Flame tamers and briquette trays. These see the worst of the grease and heat. Blaze sells a 316 perforated flame tamer upgrade for its Prelude LBM, LTE and LTE+ grills, which is the cheapest 316 part you can add to an existing grill.
- Fasteners, hinges and trim. Where a brand saves money if it is going to. A 304 screw in a 316 panel will be the first thing to stain; good marine builds use matching hardware.
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What is tea staining, and is it rust?
Tea staining is the brown, freckled discoloration that shows up on stainless near the ocean. ASSDA, which has studied it extensively along Australia's coast, describes it as surface corrosion that is "mainly a cosmetic problem" and does not affect structural integrity or service life. It is caused by sea salt sitting on the surface. Sea salt stays wet at lower humidity than table salt, so it keeps working on the metal long after a rain shower would have rinsed ordinary dirt away.
The conditions that make it worse read like a description of a backyard grill: horizontal surfaces that trap water, rain-sheltered spots (under a cover, under a pergola, inside an island), rough or grooved finishes that hold salt, heat tint around welds, and infrequent cleaning. ASSDA's prevention list is equally direct: use 316 or better within about 5 km of a surf beach, keep the surface smooth, design for drainage, and wash regularly with mild soap and a fresh water rinse.
Real rust-through on a premium grill is rare. What coastal customers actually experience is tea staining on a 304 body, and that is exactly the thing most warranties exclude.
How close to salt water do you need 316?
ASSDA's guidance is 316 within roughly 5 km (about 3 miles) of a surf beach and 1 km (about 0.6 miles) of still salt water, with wind and exposure able to push that out to 20 km. That is a conservative architectural standard for things like handrails that nobody washes. For a grill that gets covered and wiped down, we draw the line closer, and we base it on what we have seen on our own installs.
| Your location | Our recommendation |
|---|---|
| Oceanfront or bayfront: Long Beach, the Rockaways, Fire Island, the Hamptons, Montauk, the Jersey Shore barrier islands, Jupiter Island, Palm Beach, Stuart's waterfront | 316 marine grade grill, marine grade doors and drawers, and a cover. This is where 304 tea stains within a season or two. |
| Within about a mile of open salt water: most of the South Shore and North Shore of Long Island, coastal Westchester, Monmouth and Ocean County, most of coastal Palm Beach and Martin County | 316 if the budget allows; otherwise 304 from a brand with a strong housing warranty, washed every few weeks in season and covered. |
| Inland Queens, Brooklyn, the Bronx, central Nassau and Suffolk, inland New Jersey, inland Westchester | 304 is the right buy. Spend the difference on a better grill or a refrigerator. |
| Any location with a saltwater pool or a pool that gets shocked within a few feet of the grill | Treat it as coastal. Chlorides are chlorides, and splash and drift reach the island. |
Manhattan and the NYC boroughs are mostly harbor, not surf, and the harbor is brackish rather than full strength seawater. Rooftop and terrace grills in Battery Park City, Red Hook, Long Island City and Astoria do see salt on the wind, though, and they sit in the open with no shelter. For those we lean toward 316 if the budget is there, and insist on a cover either way.
Not sure what fits your space? Tell us the address, or the distance to the water, and we will tell you whether 304 or 316 makes sense for your island and what the difference costs on the exact layout. Book a free design consultation and we will help you narrow it down.
Which brands offer 316 or marine upgrades?
Fewer than the marketing suggests. Here is where each of our core brands stands, using the manufacturer's own product pages and spec sheets.
| Brand | Standard grade | Marine option |
|---|---|---|
| Blaze | 304 body and cast 304 burners on Prelude LBM, LTE+, LTE PRO and LUX | Yes. Premium LTE+ Marine 32 inch in 316L (body and cast burners), a freestanding version, marine grade doors, drawers, insulated jacket, island vent, and a 316 flame tamer upgrade for non-marine LTE grills. Prefab islands with the marine grill are sold as the Sunrise, Sunset, High Noon and Golden Hour collections. |
| Broilmaster | Stainless B-Series | Yes. B-Series 32 inch Marine Grade: 316 housing and 316 cast burners, 14,000 BTU rear infrared burner, built-in or on a cart. |
| Fire Magic | 304 throughout: housing, double-wall hood, cast burners and Diamond Sear grids | No 316 line. Lifetime warranty on housing, burners and grids is the selling point for coastal buyers. |
| Twin Eagles and Delta Heat | 304 with heli-arc welded seams; Twin Eagles burners are 14 gauge 304 | No 316 line. Welded construction removes the crevices where salt collects, which matters more than people think. |
| Lynx | 304 welded body; ceramic main burners | No 316 line. Lynx's product pages list "Marine Grade: No" and the warranty excludes boats and watercraft. |
| Hestan | 304 welded body; 321 stainless Trellis burners | No 316 line in our catalog. Hestan's colored powder-coat finishes add a layer over the steel, which some coastal customers prefer for that reason. |
| Summerset | 304 on the TRL Pro; the Sizzler lines list 304 on our store pages but Summerset's own installation manuals call out 443 for the body, so ask us before buying a Sizzler for the shore | No 316 line. Coastal installs are "subject to manufacturer review" under the warranty. |
If you want a true 316 grill head today, it is Blaze or Broilmaster. If you want the longest warranty on a 304 head, Fire Magic and Twin Eagles both put the housing under lifetime coverage.
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Does the steel grade change the warranty?
Not in the way most people hope. Lifetime grill warranties cover defects in materials and workmanship and, in some cases, rust-through. None of the brands we carry warrant against discoloration. The specifics, from the manufacturers' published terms:
- Blaze: lifetime on housing, burners, grates, flame tamers, heat zone separators and other stainless parts; one year on electrical and ignition. Registration within 30 days is required. The Marine Grade LTE+ carries the same lifetime terms; it does not get a longer or different warranty for being 316L.
- Broilmaster: limited lifetime against rust-through on the stainless housing, grids, cast burners and built-in components (one-time replacement); 5 years on flame tamers, partitions and infrared burners; 1 year on valves, knobs and igniters. Original purchaser only.
- Fire Magic: lifetime on cast burners, cooking grids and housing; 15 years on valves, liners and backburner assemblies; 1 year on ignition and electronics.
- Lynx: lifetime on body housings, ceramic burners and grates, but stainless parts are covered only for rust that affects structural integrity. Surface corrosion, discoloration and surface rust are excluded, and the terms list salt, humidity, chlorine and fertilizers as conditions that damage stainless.
- Summerset: lifetime on construction, grates and burners; 3 years on electrical. The current terms exclude "discoloration, surface rust, corrosion, or oxidation," and state that coastal, humid and salt environments are subject to manufacturer review.
The practical reading: a warranty will not save a 304 grill from tea staining on the beach. The steel grade is what saves it. Buy 316 where it is needed, register the grill, keep the receipt, and photograph the install.
How do you care for stainless near the coast?
The routine is short and it is the same for 304 and 316. The difference is that 316 forgives you when you skip it.
- Rinse with fresh water every week or two in season if you are oceanfront, monthly if you are within a mile. A hose is fine. The point is to wash salt off before it concentrates.
- Wash with mild soap and warm water, rinse, and wipe dry with the grain. ASSDA's advice is to clean the grill whenever you would clean the nearby windows.
- Use a stainless cleaner or polish on the body and hood a few times a year. It leaves a thin film that sheds water and salt.
- Never use chlorine, bleach or abrasive pads. Chloride cleaners attack the passive layer. Steel wool leaves carbon steel particles that rust in place. Muriatic acid for the patio pavers must stay far from the island.
- Cover it, but let it breathe. A vinyl cover with felt backing keeps spray off; take it off after rain so trapped moisture does not sit on the hood. Our grill cover collection is sized by model.
- Treat stains early. Light tea staining comes off with a non-abrasive stainless cleaner and a soft cloth. Established staining usually needs a passivating cleaner; call us before you reach for anything stronger.
From our install team
On Long Island installs we see more staining on the doors and drawers below the grill than on the grill itself, because the grill gets wiped after every cook and the cabinetry never does. If you are going 316 on the head, match it with Blaze's marine grade doors and drawers, or at least wash the whole island face, not just the hood.
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Our recommended models
We picked these by steel grade first, then by how the warranty treats coastal use, then by how often our own crews install them without callbacks. All are active in our store.
Which should you choose?
Choose a 316 marine grade grill if:
- You are oceanfront, bayfront, or within about a mile of open salt water.
- The grill lives on a boat, a dock, a roof terrace facing the harbor, or next to a saltwater pool.
- You will not wash the grill weekly and you want it to look new anyway.
- A Blaze LTE+ or Broilmaster B-Series fits the way you cook; those are the 316 options.
Choose a 304 grill if:
- You are inland, or more than a mile or two from salt water with no pool next to the island.
- You want a Fire Magic, Twin Eagles, Lynx or Hestan and the features that come with them.
- You will cover the grill and rinse it in season.
- You would rather put the price difference into a refrigerator, a side burner or better doors.
Avoid 430 or 443 bodies if:
- The grill is going into a permanent island anywhere near the coast.
- A magnet grabs the side panels in the showroom.
- You expect it to last longer than the countertop around it.
Our recommendation: for the Hamptons, Fire Island, the Rockaways, the Jersey Shore islands and oceanfront Palm Beach County, buy the Blaze Premium LTE+ Marine and pair it with Blaze's marine grade doors and drawers. For everyone else, a 304 grill from Fire Magic, Twin Eagles, Lynx, Hestan or Blaze is the better use of money, as long as it gets a cover and a rinse. The one thing we will talk you out of is a magnetic-grade grill head in any island east of the Nassau line.
Frequently asked questions
Is 316 stainless steel worth it for a grill?
Within about a mile of salt water, yes. 316 adds 2 to 3 percent molybdenum, which resists the chloride pitting that causes tea staining on 304. Inland, 304 is the better value because the extra resistance never gets used.
Will a 304 stainless grill rust near the ocean?
It will tea stain: brown surface spotting that is cosmetic rather than structural. Rust-through on a premium 304 grill is rare, but staining within the first couple of seasons on an uncovered, unwashed oceanfront grill is common, and warranties do not cover it.
How can I tell if a grill is 304 or 430 stainless?
Put a magnet on the body panels. 430 and 443 are ferritic and pull hard; 304 and 316 are austenitic and show almost no pull. A faint tug on a sharply bent edge can happen on real 304 because cold working changes the structure, so test flat areas.
Can a magnet tell 304 from 316?
No. Both are non-magnetic. The only way to know you are getting 316 is the manufacturer's spec sheet and model number, such as the MG suffix on Blaze Marine Grade SKUs.
Which grill brands make 316 marine grade grills?
In our catalog, Blaze (Premium LTE+ Marine in 316L, plus marine grade doors, drawers, jackets and flame tamers) and Broilmaster (B-Series Marine Grade in 316). Fire Magic, Twin Eagles, Delta Heat, Lynx, Hestan and Summerset build in 304 and do not offer a 316 grill head.
What is tea staining on stainless steel?
Brown discoloration caused by sea salt sitting on the surface. It is most common within a few miles of surf and is made worse by horizontal surfaces, sheltered spots, rough finishes and infrequent washing. It does not affect the strength of the part.
What should I not use to clean a stainless grill?
Bleach, chlorine cleaners, muriatic acid and steel wool. Chlorides attack the protective layer and steel wool leaves carbon particles that rust in place. Use mild soap, fresh water, a soft cloth, and a stainless polish.
Does a saltwater pool count as a coastal environment for a grill?
Yes. Pool water chlorides and shock chemicals drift and splash onto the island. If the grill sits within a few feet of a saltwater or heavily chlorinated pool, treat it like a beachfront install.
Talk to a specialist
Building near the water? Get the steel grade right before the countertop goes on.
We have been designing, selling, installing and servicing fire features and outdoor kitchens for over 30 years across New York City, Long Island, Westchester, New Jersey and South Florida. Give us the address and we will tell you whether 304 or 316 belongs in your island, and spec matching doors, drawers and refrigeration to go with it.
Book a free consultationCall 718-326-4328Showroom: 58-30 Maspeth Ave, Maspeth, Queens.
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Written by the NYC Fireplaces & Outdoor Kitchens team. Last reviewed October 2026. We sell, install and service the products discussed here.
Sources:ASSDA, Preventing Coastal Corrosion (Tea Staining), ASSDA, Grade 304, ASSDA, Grade 316, AZoM, Grade 430 stainless, AZoM, Grade 316L stainless, BSSA, magnetic properties of stainless steels, Blaze Marine Grade Premium LTE+, Blaze Premium LTE+ 32, Fire Magic warranty, Fire Magic grill features, Lynx Professional warranty, Twin Eagles C Series, Summerset warranty, Summerset Sizzler Pro manual. Specifications change; always confirm with the manufacturer's current installation manual.