Blog — February 9, 2026
Electric radiant mats are the more common retrofit for a single bathroom — they install directly under the tile with a simple thermostat. Hydronic (water-based) systems tie into the home's boiler and heat larger areas more efficiently, but they're a bigger job to add after the fact. Most of our bathroom remodels use electric; whole-home projects sometimes bring in hydronic during framing.
A radiant mat installed directly on subfloor without an uncoupling membrane transmits every seasonal movement straight into the tile. We install a membrane system (typically Schluter Ditra-Heat) that isolates the tile from substrate movement and holds the heating cable in place — it also acts as a vapor barrier.
Heating cable spacing and wattage should be calculated for the specific room, not assumed. Too little coverage near an exterior wall or window leaves cold spots; too much drives up the electric bill for marginal comfort gain.
For a typical primary bathroom, an electric radiant floor on a programmable thermostat adds a modest amount to a monthly electric bill when used on a timer for morning and evening — most homeowners find it worth it after the first winter.