When to replace a grill comes down to three checks in order. First, the body: if the cookbox is rusted through or the frame is failing, replace it, because no set of parts fixes the structure. Second, the warranty: many makers cover burners and cookboxes for years, so a failed part may cost nothing. Third, the money: compare the parts total with what an equivalent new grill costs today, not what you paid years ago, and add the parts most likely to fail next. A sound body with worn burners, igniters or grates is usually worth repairing.
Two kinds of parts: the ones that wear and the ones that decide
A gas grill is built from two groups of parts, and they answer the repair question differently.
Wear parts are expected to be replaced over the life of the grill: burners, igniters, heat tents or flavor bars, grates, and the hose and regulator. Replacing them is maintenance, not a sign the grill has failed. Weber's warranty page, for instance, lists burners with their own coverage terms separate from the cookbox, which tells you they are treated as parts that can be swapped.
Structural parts decide whether the grill has a future: the cookbox (firebox), the lid, and the frame or cart. These are rarely sold cheaply, if they are sold at all, and replacing them usually means taking most of the grill apart.
The rule that follows is simple. Wear parts on a sound body: repair is usually the right call. A failing body: parts are money spent on a grill that is ending anyway.
Check 1: Is the body still sound?
Do this with the grill cold, the burners off and the tank valve closed.
- The cookbox. Remove the grates and heat tents and look at the floor and lower walls. Surface rust over solid metal is normal. Flaking, a spot that flexes when pressed, or any hole means the wall has thinned. A gas grill with a hole under or near the burners should not be used, because heat, flame and grease can escape toward the hose and valves below. The CPSC Gas Grill Fact Sheet (read September 27, 2026) says to keep hoses away from the hot surface and from areas where grease could drip on them; a rust hole defeats that.
- The frame and cart. Look at the legs, welds and the supports under the cookbox. A cart that racks or wobbles, or rust at the joints, is a structural problem. We explain why rust tends to start at welds in why powder-coated steel rusts at the welds; grill carts follow the same pattern.
- The lid and hinges. A lid that no longer closes squarely or a hinge that has rusted through affects how the grill holds heat and how safely you can open it.
If the body fails any of these, the rest of this page is academic. That grill is a replacement, or a warranty claim.
Check 2: Is it still under warranty?
Before pricing parts, read your owner's guide. Warranty terms can be long, and they often cover exactly the parts that fail.
Weber's warranty page (read September 27, 2026) shows how much this varies by line. The Genesis II and Spirit II series list "All Parts – 10 Years (excluding normal wear and tear and subject to additional terms and conditions in the warranty)." The Spirit gas grill lists its cookbox and lid at "10 years, no rust through/burn through" and stainless steel burner tubes at "10 years, no rust through/burn through." Weber adds that you should refer to your owner's guide for the terms that apply to your product.
Char-Griller's warranty information page (read September 27, 2026) lists a "5-year burn and rust-through warranty" on defective parts, covering the original purchaser only, with registration and a receipt required. It excludes surface rust and discoloration.
Two practical points. A warranty that covers "rust-through" or "burn-through" is about holes, not cosmetic rust. And a claim needs the model and serial number, proof of purchase and clear photos, so gather those before you call.
Check 3: Do the arithmetic with today's prices
This is where most people use the wrong number. The price you paid years ago is a sunk cost. What matters is:
- Today's parts total. Price every part you need now, from the maker or a supplier that lists the part for your exact model. Write the date next to each price, because grill part prices move.
- Today's price for an equivalent new grill. Not the cheapest grill in the store: one with similar build quality, burner count and features to yours. A like-for-like comparison is the only fair one.
- The next failures. On an older grill, the part that just failed is rarely the only tired one. If the burners are gone, look hard at the igniter, heat tents and grates. Add any that are close to failing, because you will be buying them soon either way.
Then compare. If the parts total, including the likely next failures, is a small share of an equivalent new grill and the body is sound, repair. If it approaches the price of the new grill, or the body is marginal, replace. There is no fixed percentage that fits every grill; the point is to compare against the right number.
The same do-the-math-yourself approach runs through our guide to costing an electric versus propane patio heater, because in both cases the sticker figures people quote are the wrong inputs.
Symptoms and what they usually cost you
Most "my grill is dying" symptoms trace to a wear part, which is good news. Use this to sort them before deciding.
| Symptom | Usual cause | Repair or replace? |
|---|---|---|
| Won't spark or light by the button | Igniter or its battery | Repair |
| Weak flame on every burner | Tank level, regulator bypass, or the hose and regulator | Diagnose first; usually repair |
| One burner weak or uneven | Blocked burner tube, or a rusted burner | Clean or repair |
| Yellow, sooty flame | Air and fuel mixing, often a blocked tube | Clean first |
| Flare-ups everywhere, uneven heat | Worn heat tents, grease buildup | Repair and clean |
| Rust hole in the cookbox | Rust-through | Replace, or warranty claim |
| Frame wobbles, joints rusted | Structural failure | Replace |
Flame problems are often cheaper than they look. The CPSC fact sheet says to check the Venturi tube at least once a year for blockage by insects, spiders or food drippings, and a blocked tube can make a good burner look dead. The yellow, sooty flame case is the same mixing problem we cover for fire pits in fire pit glass gone black and a yellow flame.
Safety parts are never a place to save money
Some parts are not a budget decision. If any of these are damaged, they get replaced or the grill stops being used:
- Hose and regulator. The CPSC fact sheet says to check hoses for cracking, brittleness, holes and leaks, and for sharp bends. Use only the part the maker lists for your model.
- Anything that leaks. The CPSC method is to open the tank valve fully and brush a soapy solution (one part water, one part liquid detergent) onto the connection points. Bubbles mean a leak. If tightening does not stop it, close the tank valve and take the grill to your LP gas dealer or a qualified appliance repair person, and do not light it until it is repaired.
- The cookbox floor under the burners. A hole there is a replacement, not a patch.
Two hard limits apply whatever the arithmetic says. Never modify or bypass a regulator's safety device, and never repair a tank valve; that goes to your LP gas dealer. Natural gas grills and fixed gas lines are licensed gas fitter work.
A last check is quick: search the CPSC recalls site for your grill's brand and model. A recalled grill is a conversation with the maker, not a parts order.
If you do replace it
The CPSC fact sheet's buying advice is short: buy grills and containers that bear the mark of a nationally recognized testing laboratory. Beyond that, the things that made your old grill fail are worth carrying into the choice: the cookbox material and its warranty terms, whether parts are sold for the model, and whether a cover and a dry storage spot will be part of the routine. Covers help, but they can also trap moisture, which we look at in do fire pit covers prevent rust.
FAQ
How do I know when to replace a grill? Replace it when the cookbox is rusted through, the frame is failing, or the parts you need now plus the parts likely to fail soon approach the price of an equivalent new grill. A sound body with worn burners, igniters or grates is usually worth repairing.
Is it worth replacing burners on an old grill? Often, if the cookbox and frame are solid. Burners are wear parts. Check your warranty first; Weber, for example, lists separate burner coverage on some lines.
Should I compare repair cost to what I paid for the grill? No. Compare it to what an equivalent new grill costs today. The original price is a sunk cost and does not tell you what replacing it would cost now.
Can a rusted grill be repaired? Surface rust can be cleaned. A hole in the cookbox is rust-through, which means a replacement cookbox if the maker sells one, a warranty claim if it is covered, or a new grill.
How long should a gas grill last? It depends on build quality, weather and care, so we do not give a fixed number. The practical test is the body: while the cookbox and frame stay sound, the wear parts can keep being replaced.