Sarpedon wrote:Heavy metals can often get into the water from the hot-water pipes. This is why you are supposed to boil cold water in cooking rather than hot water.
I don't have a heater, I keep them at room temperature (now about 68 degrees). Either way I would have to add the cold water initially for the heater to warm it up.
You need a submersible heater for your turtles' tanks. It's important for your turtles' health. Turtles have very poor circulation & the only way they can digest food & have a healthy immune system is if the water is kept between 76-80 degrees F (that helps circulate the blood around their body which delivers vital nutrients to their organs). There are some great submersible heaters out there that do an awesome job & honestly, it is a small price to pay considering how much benefit your turtles will get. Vet bills for Pneumonia from cold water can cost well over $100, whereas a cheap $20-$35 submersible heater can prevent you from EVER having to visit a vet. Think of a water heater as a kind of "health insurance."
And FYI - water sitting in pipes, even cold pipes overnight, can take on the copper & heavy metals you talked about. But keep in mind that this happens in the wild also (metals in the water from minerals in soils in streams/ponds/lakes). The important thing is to keep up with regular water changes to prevent metals from building up in the tank.