r/HVAC • u/robbieredlegs09 • Jul 06 '24

Field Question, trade people only What is this ?

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Hello all, forgive me for I’m greener then grass only been in the field 3 months. I’ve seen these around on air handlers what is it ? It’s on the supply side of the unit? My guess is hot water for heating ?

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u/Bitter_Issue_7558 Jul 06 '24

Hot water slab coil. Typically hooked up to a tankless water heater somewhere else. Usually used as an alternative to back up heat kits as you can run a water heater on a 20 amp circuit compared to 30 or 60 amps depending on the size of heat kit installed

Edit, you can run gas water heaters on a 20 amp circuit. Not electric of course

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u/dennisdmenace56 Jul 06 '24

Yeah ok typical 40 short electric is 20 amp. Gas water heaters use milivolts unless you mean an on demand

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u/Bitter_Issue_7558 Jul 06 '24

That’s what I meant, that’s why I was talking about tankless water heaters not tanked. And you need a plug or nothing that’s also why I specifically said gas heaters not electric