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.

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. 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. 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.

And i would never recommend the use of a tankless water heater for a hydronic space heating system. We will also be installing 2 separate water heaters. You really only need a maximum of 120 f for your floor. Water heater for radiant heat water heaters are good for radiant floor heating because they maintain a low temperature.

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. So using the unit for radiant heating generally has little or no effect on the sizing calculation. Tankless water heater can be used to produce radiant heating.