Pretty interesting to hear of people not using heaters, I guess if you keep the house consistantly warmer at around 74 as stated there really isn't much need for a heater. Perosnally I think you guys might save some money by keeping your house cooler in the winter and using a heater in the tank. Our house is pretty well controlled as well but in the winter the house temp drops to 16C over night which is pretty typical for people with programmable thermostats. Heating the tank as appose to the whole house makes more sense to me.

My house is set to 21.5 C, but remember there are pumps in my water heating things also. So if something failed there, then Yeah, my temp will drop. The lighting really doesn't make things change much, maybe a degree or 2, at the most, this is the fluctuation I have overall.

Things that heat my water at all times are:
- 2 skimmers
- Reactor pump
- 2 #4 Koralia Wave maker pumps
- return pump
- off course lights during day time. I should also note that my Hamilton Belize fixture doesn't run that hot, very big fan system in it. One thing I can say, it is noisy, but I don't think the heat absorbed into the water is that great because of the ventilation/fan system this light has.

All I can say, in my case, all is fine.

As I stated prior, in most cases most people don't have the luxury of a home that is climate controlled, so a heater or chiller is required. In my case all is good with the systems I have in place.

HEHE, well you got us there!