What is causing my toilets to kick on every other minute? It's not flushing – it sounds like the water is filling up. Does this make the electric bill higher?
Water – My Toilet Keeps Making Sounds Like It Is Filling Up Every 3 Minutes
toiletwater
Related Solutions
We had a similar problem with our Duravit toilet. We followed the instructions above, and after pulling out both the intake water controller portion, as well as the flush control, he didn't find any calcium build-up: just some rust stains. 
As a final check, my husband reached down into the toilet tank and felt something stuck in the bottom stopper valve. He felt what he thought was a broken piece of rubber, and after tugging on it with some force, he pulled the foreign object out in his hand from the access hole in the wall, and found a perfectly intact, but dead scorpion
]2 It must have died just that morning when the toilet started running. Luckily he wasn't stung.
All these lines are connected, but it's not easy to say how without inspecting under the floor. I'd say there's a good chance the shower, possibly sink too, are connected to a one vent, and that drain is a wet vent for the toilet where they join further down stream. Then everything runs down to a main stack. That would be a fairly typical setup.
If you see bubbling in the toilet from the bath, or hear gurgling in the tub from the toilet, you may have a problem with a blocked vent. Otherwise, some movement can be expected. As the water rushes past the wye connection to the toilet, it causes some pressure changes pushing the water up or pulling it down on the other side of the trap (the toilet bowl). You're also likely to see that on a windy day just from wind blowing over the vent pipe on the roof. Other traps do the same thing, but you can't as easily see them.
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Best Answer
Since you aren't seeing water all over the place, your flapper is leaking a small amount of water which is causing the float to drop to a level (apparently every 3 minutes) where it detects the water is low, so it fills the tank back up. If you aren't familiar with the mechanics of the float/flapper system in toilets, take the tank lid off and flush it a few times; it's pretty easy to see what it is doing. You might be able to slight adjust the flapper by just running your thumb around the part that seats or you might need to replace it (it's cheap and easy).
As far as electric bill, it won't make your electric bill higher if you live in the city since water is fed by gravity, but in the country where water is pumped from underground, it would. The bigger concern would be water cost if you are in the city.