Can You Use A Tankless Water Heater For Radiant Heat

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.

Can you use a tankless water heater for radiant heat.

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. 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.

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. So using the unit for radiant heating generally has little or no effect on the sizing calculation. Sample temperature curve for an on demand unit. 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.

Water heater for radiant heat water heaters are good for radiant floor heating because they maintain a low temperature. One to supply domestic hot water and a separate water heater to supply the radiant floor. We will also be installing 2 separate water heaters. And i would never recommend the use of a tankless water heater for a hydronic space heating system.