boiler, un-pressurized tank, external HXer, instant DHW
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tom in maine
Minister of Fire
I'll go a step further and suggest losing all the hx and pumping treated tank water.
Our standard way of doing this, since unpressurized heating systems do scare some people, is to use a single coil as the interface with an unpressurized
tank such as ours.This is used to input and remove heat from the tank.
This eliminates two pumps, two plate hx and half of the air removal/expansion hardware.
The system at my house, uses only a DHW hx directly from the tank. A bronze 007 pumps from the tank to the 5 zone radiant distribution system. I use a 009B for the boiler since I plumbed with 1" copper and was not sure about the boiler heat output. (It peaked at 120K last night at 7.3gpm) The return lines are submerged so there
is no water noise. We use all non-ferrous materials, so the water is not treated.
Coils are not inexpensive, but they are passive devices and when designed properly, do function very efficiently. We find our DHW hx operates in the high 90's%. The space hx are similar.
My 2 cents worth. Now that the heating season is upon us up here. (6" of snow tonight and a Nor'easter!?)
Our standard way of doing this, since unpressurized heating systems do scare some people, is to use a single coil as the interface with an unpressurized
tank such as ours.This is used to input and remove heat from the tank.
This eliminates two pumps, two plate hx and half of the air removal/expansion hardware.
The system at my house, uses only a DHW hx directly from the tank. A bronze 007 pumps from the tank to the 5 zone radiant distribution system. I use a 009B for the boiler since I plumbed with 1" copper and was not sure about the boiler heat output. (It peaked at 120K last night at 7.3gpm) The return lines are submerged so there
is no water noise. We use all non-ferrous materials, so the water is not treated.
Coils are not inexpensive, but they are passive devices and when designed properly, do function very efficiently. We find our DHW hx operates in the high 90's%. The space hx are similar.
My 2 cents worth. Now that the heating season is upon us up here. (6" of snow tonight and a Nor'easter!?)
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