I just did a thread on here last week with the same issue. I was looking for a thermostat to handle more watts for my walk in incubator. I have been using a johnsons thermostat and its been fine but i have made the walk in incubator bigger to handle even more clutches. I talked to rich at reptile basics and the johnsons were the highest rated thermostats on the market i could find. But heres another thing i figured out. You dont need to have the oil heater on the 1500 watt setting. Mine has a 900 and a 1500 setting. It works fine for a 6 ft by 8 foot walk in incubator. Temps stay at 89 and if there is a flucuation its only like 1 to 2 degrees at best which is fine.