Its most likely a very trivial question but central heating systems aren't something i'm familiar with, I've had a good dig around on the internet and cannot find any reference that states that specifically using central heating consumes water, not considering any other form of water consumption e.g. using the shower.
Plumbing – Does using central heating increase water usage
central-heatingplumbingwater
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Best Answer
Only if you have a humidifier installed, and in that case it would be a very small quantity.
To determine whether your system has a humidifier, examine the primary ducts near the furnace unit. Look for a tray or housing with a water line and possibly a power cord.
Here's an example. Notice the unit attached to the intake duct. It has a copper supply line and a PVC drain line.