Can You Use A Tankless Water Heater For Radiant Heat

A tankless hot water heater is ideal for this application since there is no water to be kept hot at all times.

Can you use a tankless water heater for radiant heat.

Sample temperature curve for an on demand unit. 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. Make sure you invest in a high efficiency tankless water heater. 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.

One to supply domestic hot water and a separate water heater to supply the radiant 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. So using the unit for radiant heating generally has little or no effect on the sizing calculation. You really only need a maximum of 120 f for your floor.

Tankless water heater can be used to produce radiant heating. However it is important to understand that not all of them are suitable for this task. 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. And i would never recommend the use of a tankless water heater for a hydronic space heating system.