A toilet mixing valve is also known as a temperater valve. Condensation can build up on a toilet and in some cases, cause enough sweating that it appears the tank is leaking. If you are not familiar with plumbing installation procedures, installation of a mixing valve is best left to a plumber. You may want to try DIY alternatives such as insulating with a tank jacket that absorbs the condensation, or specially designed drip pans. However if sweating is a constant problem you should consider having the mixing valve installed.
How It Works
The Y-shaped mixing valve must be installed near a hot water source. The Y valve is connected to the hot and cold water sources and then to the shutoff valve. The premise is that, by mixing hot and cold water, the surrounding air temperature and the tank temperature will not differ enough to allow condensation to form.
Things to Consider
A mixing valve is generally installed for areas where the tank temperature is generally held below 50 degrees. The mixing valve mixes the hot water into the tank when flushed. It does not, however, maintain the water at a certain temperature. You may still want to install a jacket or drip pan along with the mixing valve.