Here at ReefStuff.com, Pacific Coast Imports Gen-X Quartz Heaters 100, 200, and 300 watt sizes are available. These units allow precision temperature control, and have a easy to adjust temperature setting. The new heat resistant glass they are made of can withstand being on even out of the water. A very high quality product that will keep your tank or stock water at the appropriate temperature. We also stock the new and improved Pacific Coast Imports Gen-X 500 Watt Titanium Heater, which is the great predecessor to the quartz heaters. We offer only the very best at the lowest price.