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Hydronic heating systems are one option when it comes to underfloor heating.  These systems differ from electric underfloor heating systems in that they use a mixture of water and anti-freeze to heat the home.  This anti-freeze may be propylene glycol.  It serves as a heat transferring liquid trapped in a closed loop that circulates under the floor and to a boiler.

A key aspect of a hydronic heating system is the underfloor heating pipe.  Different kinds of pipes are used based on the specific needs of the project and heating system.  Copper or steel are more traditional materials to use for an underfloor heating pipe, and they are still in use in some locations.  Nowadays, newer materials like plyethylene are becoming more popular.

Many people who get an underfloor heating system in their home try to install the system themselves.  This is possible with DIY underfloor heating kits.  However, these underfloor heating kits are more suited to electric underfloor heating systems.  These systems use simple mats and wires to create heat under the floor.

A hydronic heating system usually cannot be installed by the homeowner alone.  This system is a little more complicated than an electric heating system, particularly because these systems include elements such as boilers.  Things like boilers and circulators will require skilled designers and professional trades people to install.  The controls, such as fluid pressure and temperature, will also require professional installation. 

Luckily, while professional installation is needed, modern innovations like sub-stations can make the process quicker and cheaper.