Weber Slate 30 vs 36

Buy the Weber Slate 30 unless you regularly cook for more than six — it has better heat density than the 36 and its footprint is four and a half inches shallower. The 30 is 540 square inches and three zones at 66.7 BTU per square inch. The 36 is 756 square inches and four zones at 63.5. The larger griddle is the less densely heated one, which is not what most buyers assume.

The smaller griddle wins on heat per square inch

36,000 BTU across 540 square inches is 66.7 BTU per square inch. 48,000 BTU across 756 is 63.5. Weber adds surface area slightly faster than it adds burner output, so the 30 recovers marginally better under a proportional load.

Five percent is not a difference you will notice, and that is exactly the point: there is no performance penalty for buying the smaller Slate. Everywhere else in this category stepping down a size means stepping down in heat density — the Blackstone 28 drops to 64.8 from the 36’s 78.0 — and here it does not. Why the ratio matters more than the total explains the arithmetic.

Both sit in the low-to-mid 60s, which is the honest limitation of the Slate line: you are buying a rust-resistant cooktop and paying for it in available heat relative to a Blackstone or a Traeger. That trade is the subject of Blackstone vs Weber Slate.

The footprint finding: it grows backwards

This is the detail that should change the decision, and it is buried in the dimension lines.

The 36 is only 1.2 inches wider than the 30 overall — both are roughly six-foot units once the side tables are out. It is 4.5 inches deeper. Nearly all of the extra cooking surface comes out of your front-to-back space, not your wall run.

That inverts the usual advice. If your constraint is a narrow patio or a fence line, the two griddles cost you almost the same width and you may as well take the surface. If your constraint is a walkway, a railing or a deck you have to get past the griddle on, the 36 takes nearly half a foot more of exactly the dimension you cannot spare.

Weber publishes the 30 at 140.34 lb. Neither of these is a griddle you reposition casually.

Three zones against four

The 30 gives you three independently controlled burners, the 36 gives four. Three is enough to sear, cook and hold at the same time, which covers essentially all household cooking. The fourth zone is a staging lane — it earns its keep when you are plating breakfast for eight in waves and does nothing for a family of four.

Worth noting against the rest of the category: the Slate 30’s three zones over 540 square inches beat the Blackstone 28’s two zones over 525 on control, at the same practical size. Within the Weber line, three zones is genuinely sufficient.

Depth of food, not just depth of cart

One real argument for the 36: a 28-inch-deep cart means a deeper plate, and plate depth is what lets you run two rows of food with a working lane between them. On a shallow griddle you end up cooking in a single line and using the edges as storage. If you cook a lot of staged breakfasts — bacon holding at the back, eggs going on at the front — that second row is worth more than the raw square inches suggest.

If both are too much griddle

The third pick is the Weber Slate 22 Tabletop: 352 square inches, two zones, the same rust-resistant cooktop, and a format you can carry. Its heat density is the lowest in the Slate line at 45.5 BTU per square inch, so it is a griddle for moderate-heat cooking rather than searing — but it is the Slate for people without a patio.

Which to buy

Full spec sheets: Weber Slate 30 and Weber Slate 36.