Here are some photos of the heating system in the main house, put together by myself and Kaleb in 2004 and most recently in 2011 when we added some new components to it in order to run heat out to the new house. This boiler takes care of all the heating and hot water needs for both houses, including the basement apartment. This comes to: 3 kitchens, 5 bathrooms, two clothes washers. The water heater, the blue thing on the right contains only 55 gallons of water, but, because it is connected directly to the boiler, it can produce 190 gallons of piping hot water per hour.
Four pumps, for four heating zones. Sounds simple, huh?
The pump (red thing) second from left is the one that sends out hot water to the rear building.
Here you can see the mixing valve just below the pump on the far left which is the pump sending water to the rear building. Because it is in-floor heat, we used the mixing valve to mix down the 180 degree boiler water down to a more comfortable 110 degrees which should produce a maximum floor surface temperature of 85 degrees Fahrenheit.
Some shut-off valves on the return side of the primary boiler loop.
We had to core through the concrete and run insulated pipes underground to the new building. Here you can also see the hot and cold potable water lines running next to the heating pipes.
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Mixing valve again.
Oh. Here is a potable hot water recirculation pump (black thing in center of photo), which circulates hot water at predetermined times, so that one has almost instant hot water at the taps in the back house. This will save a ton in water bills as one won't have to run the tap for minutes at a time just to get hot water. Built by yann buchanan and Kaleb in 2004 and 2011
Here is the in-floor hydronic manifold in the new house -- partially finished, hence the messy wires. It distributes all of the hot water throughout the floor. The knobs on the top of the black manifold are balancing valves which help to evenly distribute the flow of water and heat.
Four pumps, for four heating zones. Sounds simple, huh?
The pump (red thing) second from left is the one that sends out hot water to the rear building. 
Here you can see the mixing valve just below the pump on the far left which is the pump sending water to the rear building. Because it is in-floor heat, we used the mixing valve to mix down the 180 degree boiler water down to a more comfortable 110 degrees which should produce a maximum floor surface temperature of 85 degrees Fahrenheit.
Some shut-off valves on the return side of the primary boiler loop.
We had to core through the concrete and run insulated pipes underground to the new building. Here you can also see the hot and cold potable water lines running next to the heating pipes. 
Mixing valve again.
Oh. Here is a potable hot water recirculation pump (black thing in center of photo), which circulates hot water at predetermined times, so that one has almost instant hot water at the taps in the back house. This will save a ton in water bills as one won't have to run the tap for minutes at a time just to get hot water. Built by yann buchanan and Kaleb in 2004 and 2011
Here is the in-floor hydronic manifold in the new house -- partially finished, hence the messy wires. It distributes all of the hot water throughout the floor. The knobs on the top of the black manifold are balancing valves which help to evenly distribute the flow of water and heat.
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