Can You Use A Tankless Water Heater For Radiant Heat

However it is important to understand that not all of them are suitable for this task.

Can you use a tankless water heater for radiant heat.

The system with a tankless water heater will also be much more responsive have unlimited supply of hot water and clean water running through the floor heating pipes without sediments and other mineral build ups. If you don t want to use a boiler you may be able to use a tank style water heater but only in some jurisdictions since using a water heater as a boiler may be a code violation. So using the unit for radiant heating generally has little or no effect on the sizing calculation. Because the slab installations will require less than 140 deg f water it is safe to use a water heater to heat the radiant slabs.

You really only need a maximum of 120 f for your floor. Though they are sold primarily for domestic hot water tankless heaters are actually well suited for radiant heating which operates at low temperatures compared with for example hot water baseboard. A tankless hot water heater is ideal for this application since there is no water to be kept hot at all times. Water heater for radiant heat water heaters are good for radiant floor heating because they maintain a low temperature.

Sample temperature curve for an on demand unit. We will also be installing 2 separate water heaters. Tankless water heater can be used to produce radiant heating. One to supply domestic hot water and a separate water heater to supply the radiant floor.