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January 2014 Glitch drawing: A homeowner wants to use a wood-gasification boiler as his primary source of space heating and a propane-fueled boiler to automatically come on for backup. January 2014 Fix drawing: All pressurized wood-fired boilers need a heat dump provision to which heat can be sent if a power failure occurs when the boiler is firing.

A homeowner wants to use a wood-gasification boiler as his primary source of space heating.
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The owner has read that a generously sized thermal storage tank is necessary to allow a gasification boiler to operate at consistent high efficiency.
These boilers also require protection against sustained flue gas condensation when the storage tank is at a low temperature.
He also wants a propane-fueled boiler to automatically come on for backup should he decide not to tend the fire, or if he is away.
If this temperature drops below the minimum acceptable water temperature determined by the boiler’s reset controller, the boiler and boiler circulator are turned on to provide backup heat. The piping entering the top of the storage tank in the Glitch drawing will create vertical jets that break up stratification within the tank.

This allows relatively hot water to be drawn from the tank without having to warm all 500 gal.
The original installation does not have a means of regulating the water temperature supplied from the storage tank to the low-temperature distribution system. The controller driving this circulator monitors the temperature supplied to the zones and regulates the injection pump speed to maintain an adequate supply temperature based on outdoor reset control. Upon a demand for heating, it measures storage tank temperature and determines whether the storage tank or auxiliary boiler serves as the heat source. The boiler piping in the Glitch drawing is incorrectly reversed at the closely spaced tees. That’s over 200 articles and columns covering everything from heat loss to hydraulic separation.
The zone circuits are connected across the upper and lower horizontal piping, treating the pipe as headers rather than as a primary loop.
It shows how to use modern hydronics technology to create systems supplied by solar thermal, heat pump and biomass heat sources. The piping connections in the Fix drawing have been repositioned to enhance stratification within the tank.
Such temperatures are much too high to send directly to the low-temperature distribution system.
The expansion tank size for a given system should always be verified through proper sizing methods.

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