Ring Heater A-80w 240v 1500w (Pcn 208573) 8-3/8" Od, 6-3/16" Id, 5/16" Thk, For Single Wattage On-off Switch Or Thermostat With Two Terminals--1-1/2" Wide By 17/32" Ht. This Ring Heater Exceeds Chromalox's Recommended Watt Density For Ring Heaters, And It Does Not Have A Chromalox Warranty. This Heater Is Used By Many Industries, Because It Heats Up Faster Than The 1250 Watt Ring Heater Of The Same Size That Carries The Traditional Chromalox Warranty.