Can You Use A Tankless Water Heater For Radiant Heat

We will also be installing 2 separate water heaters.

Can you use a tankless water heater for radiant heat.

So using the unit for radiant heating generally has little or no effect on the sizing calculation. Make sure you invest in a high efficiency tankless water heater. You actually have a choice between them as you can use a water heater or tankless for radiant floor heating and not just a boiler. One to supply domestic hot water and a separate water heater to supply the radiant floor.

Water heater for radiant heat water heaters are good for radiant floor heating because they maintain a low temperature. 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. Sample temperature curve for an on demand unit. You really only need a maximum of 120 f for your floor.

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