Stainless vs Cast Iron Fireplace Grate: Which One Should You Buy?

Side by side

Example figures are manufacturer rated, collected 25 October 2026.

Material: what each listing actually states

The stainless grate is clear: the Skyflame example is 304 stainless steel with 5 steel bars. The cast iron grates are less tidy: the UniFlame example is cast iron throughout its listing, but the TwentyNext example calls itself cast iron in the title while its bullets describe solid steel bars and its spec table names alloy steel, so the TwentyNext listing leaves its own material open to question.

Size and fit

The Skyflame example is an 18 inch grate that fits fireplaces with minimum dimensions of 28 inches front width, 15 inches depth and 21 inches back width. The UniFlame example measures 15.25 x 27 x 6 inches, the longest grate here at 27 inches, while the TwentyNext example measures 20 x 11.5 x 6.8 inches. Measure the fireplace opening against the stated size; the Skyflame example states minimum fireplace dimensions, while the wood-fire examples state only their own size.

Weight and handling

The UniFlame example weighs 17 pounds and the TwentyNext example weighs 11 pounds, so the UniFlame grate is the heavier one to lift and place. The Skyflame example states no weight, which leaves its handling unclear. The TwentyNext example needs no assembly and the UniFlame example arrives fully assembled, so neither of these two asks for setup work.

Gas kit or wood grate

Fuel type is the real split. The Skyflame example is a natural gas kit: grate, dual pipe burner pan, 12 inch flex line, connection fittings and damper clamp, with a burner rated up to 60,000 BTU max. The other two examples are for wood fires, with no burner and no gas parts. The UniFlame example suits indoor wood fireplaces only, while the TwentyNext example states indoor and outdoor use.

Three examples: stainless vs cast iron fireplace grate

How we scored them

The Woodlot Score weighs performance, build, value, safety and warranty. For grates, safety would mean a stated safety certification, and none of the three listings states one, so all three score zero on safety. One listing states a warranty term: the UniFlame example carries 1 year limited parts. How we pick explains the weights.

Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score. Safety counts only for powered gear or where the listing states safety features; where it does not apply, the score is taken over the remaining 90 points.

Around the Woodpile

• Check the stated size against the fireplace opening before ordering, since the three examples span different sizes.
• The UniFlame grate is for indoor wood fireplaces only, while the TwentyNext grate states indoor and outdoor use.
• The Skyflame kit is a natural gas unit, so it belongs on a gas fireplace, not a wood fire.
• Keep the stated weight in mind when moving a grate: the UniFlame example weighs 17 pounds.

Frequently Asked Questions

Is the stainless grate for wood fires?

No. The Skyflame example is a natural gas kit with a dual pipe burner pan, and no wood-burning use is stated for it.

Which grate is heavier?

Of the two examples that state a weight, the UniFlame example at 17 pounds is heavier than the TwentyNext example at 11 pounds. The Skyflame example states no weight.

Does any grate here carry a warranty?

The UniFlame listing states 1 year limited parts. The other two listings state no warranty term.

Is the TwentyNext grate really cast iron?

Its title says cast iron, but its bullets describe solid steel bars and its spec table names alloy steel, so the listing leaves the material unclear.

Can the TwentyNext grate go outdoors?

Yes. The listing states indoor and outdoor use, for fireplaces and fire pits.

Related guides

See the cast iron fireplace grates, the vertical fireplace grates, the fire pit grate vs fireplace grate and the cast iron vs steel fireplace grate.