Getting Water Temp Right When Changing?

[Yeved]

I've got very hard water and use a RO filter to pretreatment my tap water. I then leave it by the aquarium to stabilize for a day and then do my water change. The water is always colder than the aquarium water. What do you guys do?

 

[BubblesLotsOfBubbles]

I've got very hard water and use a RO filter to pretreatment my tap water. I then leave it by the aquarium to stabilize for a day and then do my water change. The water is always colder than the aquarium water. What do you guys do?

 
When I did photography the technician had what was more or less a long kettle heating element that was used to heat a large volume of water bath - guess maybe iro 200-300 litres. Have a look for one of those. Otherwise small quantity in the microwave and mix it in to the larger quantity?
 
(Just off the top of my head and of course depending upon the volume you are heating)

 

[Ch4rlie]

You could of course add a heater to the container of RO water since you leave it for a day, by the time you ready to do water changes, water will then be matched nicely at your desired temps.

 

[TwoTankAmin]

There is no meed to let it sit for a day???
 
If your tank water is 80 F and your new water is 70 F, and you do a 50^ water change the most your water can drop is by 5 degree. But the process of dding it into a tank with a heater in it means it will drop less. Fish can handle a 5 F drop in temp unless the water is already at the lower end of their temperature range and the water going in is 10F cooler than that.
 
For the tank in which I use RO/DI regularly I am still doing a 50/50 mix with my tap, so I just use warm enough water from the tap to heat the ro/di to an acceptable temp. But I am also manipulating my TDS as well as my pH.

 

[Yeved]

Good info. Thanks for replies. In the future I should be OK with mixing tap with RO water. Which means I can put warmer water into the RO water and get pretty close. I guess I'm just old school and always try to keep the water as close to the same temp as possible.