What Does Bottom Heat Symbol Mean on Oven

The bottom heat setting is one of the most overlooked functions on a modern oven — but once you know when to use it, it becomes an essential tool for getting perfectly crispy bases on pies, pizzas, and pastries. Here's what the symbol means and how to make the most of it.

What Is the Bottom Heat Symbol?

The bottom heat symbol on an oven is represented by a single horizontal line at the bottom of the symbol box. This indicates that only the lower heating element is active — no top element, no fan. Heat rises gently from the base of the oven cavity.

On some ovens, you may also see a variation with a fan + bottom line, which means the fan circulates the bottom heat for more even distribution.

What Does Bottom Heat Do?

When you select bottom heat only, the oven heats from below. This creates a hot base environment that's ideal for:

• Crisping the base of pies and quiches without overbrowning the top
• Finishing pizza bases to get them properly cooked through
• Slow cooking dishes that need gentle, steady heat from below
• Keeping food warm without drying it out

When to Use the Bottom Heat Setting

• Pizza: Use bottom heat for the last few minutes to ensure the base is fully cooked and crispy
• Pies and tarts: Prevents soggy bottoms by directing heat to the base
• Bread: Some bakers use bottom heat to get a good crust on the underside of loaves
• Slow cooking: Gentle bottom heat is ideal for casseroles and braises
• Warming food: Low bottom heat keeps dishes warm without continuing to cook them

Bottom Heat vs. Conventional (Top + Bottom) Setting

The conventional setting uses both top and bottom elements together, which is great for most baking. Bottom heat alone is more specialized — use it when you specifically need more heat at the base without browning the top further.

Recommended Tool: Pizza Steel for Maximum Bottom Heat

If you're using bottom heat for pizza, a pizza steel dramatically improves results by absorbing and radiating intense heat directly to the base of your dough. The Pizza Steel PRO by Hans Grill is an XL 1/4-inch thick conductive steel that works in ovens and on BBQs — perfect for achieving a restaurant-quality crispy base at home.

Pro Tip: Monitor Temperature Accurately

Bottom heat settings can vary significantly between oven models. Use an oven thermometer placed on the bottom rack to confirm the actual temperature. The Oven Thermometer 2 Pack (50–300°C / 100–600°F) is a reliable stainless steel option that gives you an accurate reading wherever you place it in the oven.

Summary

The bottom heat symbol (single line at the bottom) activates only the lower heating element. Use it to crisp bases, finish pizzas, slow cook, or keep food warm — it's a precise, targeted setting that gives you control over where the heat goes.