Small heat load for radiant floor

kevin coppinger_4

the method of radiant be? Slab,Staple up, etc. I did a job like this two years ago for a friend in his new wood shop. It was slab on grade three circuits, water temp of 120F and heat loss of about 19K I used a LP water heater and it seems to work well (except for the cost of the LP)...I guess the next thought would be is there a conversion to a hydroair system in the cards down the road...if so maybe a boiler would be better in the long run...kpc

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Wayco Wayne_2

I am

designing a job for an addition where they want radiant floors. The heat loss $ 10 degrees outside air is 24,000 btuh. The existing heating system is a heat pump and they have electric water heaters. There is a propane tank for their oven that they would like to draw from. What would you guys use for hot water source? WW

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Wayco Wayne_2

It will be

half slab over tubing over styrofoam on top of existing slab. The other half will be joist trak plates. I was thinking propane water heater, but the efficiency is low. To go up to a boiler seems too pricey, however an upgrade to an idirect might be good for their domestic hot water. I've heard nothing positive from those who tried to use tankless water heaters. I guess I'm just fishing for options I don't know of. WW

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ScottMP

Wayne

Look into the Buderus GB142. You may have to wait alittle for the L.P. conversion but give them a call.

Scott

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hr

A tough call

A LP or electric HW tank could meet that load. Not the cheapest way depending on KW cost or a low efficiency LP WH.

The 50,000 Munchkin would be a good choice, if you can upsell them on the higher efficiency. Generate their DHW with it and show them an efficient heat and DHW sourse Fuel prices are climbing as we speak, an ideal time to sell high efficiency equipment

If you go with a LP water heater be sure to run it up around 130° or more and use a small mix valve. Running them at normal slab temperatures really sweats (condensate)them to death quickly!

hot rod

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Wayco Wayne_2

Thanks Hot Rod

your comments mirror my thoughts exactly. I'll price both ways and let them know the long term ramifications. After that they will know what to expect. WW

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