I am purchasing a new home, and designing some renovations to several rooms. The house has a gas boiler and radiators throughout the house. For the kitchen and upstairs bathroom, I will be putting in tile flooring. To save space, I am wondering if installing PEX tubing for radiant floor heating using the supply and return from the radiator is a possibility. Can this be simply installed in place of a radiator, or does the entire radiant floor heating system (thermostats, control modules, etc.) need to be installed as well?
You may be able to use the existing radiator piping to some extent, but a number of other changes will be required:
One alternative you may want to consider is electric radiant heating. Electric radiant is available in mats that are layered with thinset between the subfloor and tile. The mats can be custom made to the shape of your room, e.g. to flow around a kitchen island. The system will come with a temperature sensor and control that is typically mounted in a wall box next to the light switches for the room. In this case, you'd simply remove the radiators, and use electric heat for those rooms instead.