Water flows

These designs as a coolant use water. Water flows from the riser or from the Central heating system. However, these floors require a pump without water will not circulate, respectively, will not and heating. Of course, you can mount system so that the water is in motion due to gravity, i.e. to the carrier, like "flowed" from the source at the end of the wire. However, this task is very difficult, and heating system area will not be too great.

Vodnany warm

Advantages:
Compared with electric floor heating, installation of water cheaper.
High quality heating at a low cost, for the energy carrier (water) is cheaper than electric energy.
Disadvantages:

There is a danger of damage to communications and, therefore, leaks.
If the pressure in the water system will fall, you will not be able to do without the water pump.
The use of water "warm floor" is considered to be unfair to others if source of water is heating. The water is passing throughout the system returns to the Central heating system and is sent to the neighbours, but already in a more chilled state. It is for this reason, in most apartment buildings it is forbidden the use of water Underfloor heating.
For mounting of water floor heating require the sanction of the relevant services, without notice as these services cannot be connected nor to water, nor Central heating.

To recap:
In normal, flat conditions, mounted system electric Underfloor heating: they do not require a pump, and it's not threatened by the danger of leaks. However, if the area that requires heating, is very considerable, it is preferable to use a water heat-insulated floor, because the power savings will affect the condition of your wallet. Most often water Underfloor heating used in private country houses and cottages.