Slightly confused by my heated flooring setup

[davejo]

We moved into a place with heated floors but it came with no operating instructions. It has a Taylor wood furnace outside to heat and circulate the water.

There are lines running to the indoor water heater. They are in the same bundle as the main water supply and return from the outside furnace. The valves are off at present.

The valve plumbing circuitry enables the cold water supply for the indoor water heater) to be diverted somewhere. I guess the two possibilities are that the water would be preheated directly by the wood furnace, or indirectly by the concrete slab mass.

Which would be the most likely scenario?

 

[kj_mustang]

How many water lines run into the water heater?

 

[TheEquineFencer]

The water for your domestic hot water heater inside, probably has a cold water line going out to the Taylor heater, returns into the hot water heater. The water for your slab comes off the top one or each side of the rear of the Taylor heater and returns in the bottom at the rear. At the front end where the door you feed the heater, there's an Aquastat to set the water temp. This is what controls the blower fan on the front door of the heater. There's a damper on the flue at the front you can manually adjust.

Make sure the domestic water coil inside the heater hasn't froze and burst this time of year.

I just refurbished my 40+ year old Taylor Heater, I installed a new barrel and such.