The SGS305TS is a 30-inch sealed-burner gas cooktop from Thermador’s Masterpiece line, rated at 52,000 total BTU on natural gas (45,200 BTU on propane) across 5 burners, including a 16,000 BTU center burner built for rapid boiling and high-heat searing. It does not include Thermador’s ExtraLow simmer burners, so all 5 burners use the same mechanical push-to-turn knob control found throughout Thermador’s sealed-burner gas lineup.
Because it runs on knob-controlled mechanical ignition rather than touch electronics, most service calls on this cooktop trace back to a fouled spark electrode, a burner cap seated incorrectly on its base, or a reignition sensor that isn’t detecting a blown-out flame – not an electronic control-board problem.
Key Features
- 30-inch, 5-burner sealed gas cooktop (Masterpiece line)
- 52,000 total BTU on natural gas / 45,200 BTU on LP
- 16,000 BTU center burner for rapid boiling and searing
- Cast-iron grates with rubber feet, stainless steel surface
- Automatic reignition if a burner flame blows out
Most Common Issues on This Model
If you smell gas, shut off the gas supply at the shutoff valve first, then check for a cracked burner cap, clogged port, or failed reignition switch before calling for service.
A burner that clicks continuously or won't catch usually points to a dirty or misaligned spark electrode rather than the gas valve.
Yellow-tipped or uneven flames usually mean a burner port is partially blocked or the cap isn't seated flush on its base.