for the dump zone.
3. Install a tee with a 1”branch coming out of the supply tapping of the 3WOOD

C.3WOOD Boiler with circulator Piped in Parallel with Oil/Gas Boiler

In the traditional American baseboard, hydronic system, the heating temperature in the house or zone is controlled by circulating or not circulating water of a fairly high and relatively constant temperature to radiation. The thermostat used in such a system is a simple switch to a relay which turns the circulator on and off. The vast majority of American heating systems use cast iron boilers which have internal tankless coils for producing domestic hot water. The parallel piping arrangement is the correct application for maintaining temperature in the oil/gas boiler with wood heated hot water as well as heating the radiation in the house. Since the specifics of such a system will vary from installation to installation, the following procedure provides an example of one specific installation which can be used as a model for actual situations.

1.Insure that the existing system has flow checks or electric zone valves in the supply lines to the various heating zones, and that the Space heat and DHW circulators are mounted on the return line going back to the Oil/Gas boiler. If not, they must be installed in these locations.

2.Remove the existing radiation supply and return lines from the oil or gas-fired boiler. Install pipe tees on the supply and returns from nipples coming out of the existing oil/gas boiler. NOTE: Occasionally, extra supply and return taps are available on oil/gas boilers. These plugs may be removed and used to run the lines between boilers. Re-install the supply and return lines.

4.Then install another tee with a ¾” branch for the Aquastat for the 3WOOD into the branch of the tee using the 3/4 “ immersion well. Caution: Be careful flue pipe and the 3WOOD boiler aquastat.

5.Pipe from this tee to the supply pipe on the existing oil/gas boiler.

boiler

boiler’s circulator. Install the Honeywell L4006B to maintain a 12” minimum clearance between the

Note: By adding the gallonage from the addition of the 3WOOD boiler, an expansion tank should be added or the existing tank should be increased in capacity.

6.Install a tee with a 1” branch coming out of the return tapping of the 3WOOD boiler for the dump zone.

7.Install piping, flow check and circulator from 3WOOD boiler to the return manifold installed on the oil/gas boiler.

Note: Aquastat settings for the existing oil/gas boiler should be as follows: High Limit – 165F

Low Limit - 150F Circulator - 140F

But these settings can be raised if the 3WOOD boiler isn’t fired for extended periods of time.

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QHT Boiler manual
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Boiler specifications

The QHT Boiler is an advanced heating solution designed for both residential and commercial applications. Known for its efficiency and innovative technology, the QHT Boiler has rapidly gained recognition in the industry for its unique features and superior performance.

One of the main characteristics of the QHT Boiler is its high-efficiency rating. Utilizing cutting-edge technology, the boiler operates at a remarkably high thermal efficiency, which not only reduces energy consumption but also lowers operational costs for users. This efficiency is achieved through smart design and effective heat exchange systems that ensure maximum utilization of fuel.

Another notable feature of the QHT Boiler is its compact and space-saving design. Many models are engineered to be installed in tight spaces while still delivering powerful heating capabilities. This is especially valuable in urban environments where space is at a premium. The boiler’s sleek design also ensures that it can blend seamlessly with modern home aesthetics.

In terms of technology, the QHT Boiler incorporates advanced control systems that allow for precision temperature management. Users can easily set and adjust the desired temperatures through an intuitive interface, whether via a digital display or a mobile application. This flexibility ensures that heating needs are met efficiently, providing comfort without excess energy use.

Durability and reliability are key characteristics of the QHT Boiler. Constructed from high-quality materials, the boiler is designed to withstand the rigors of daily operation while minimizing the need for maintenance. This reliability is crucial for both homeowners and businesses, as it translates to reduced downtime and long-term cost savings.

Sustainability is another critical focus of the QHT Boiler’s design. Many models are compatible with renewable energy sources, including solar thermal systems, allowing users to reduce their carbon footprint. The incorporation of features like modulating burners helps to adjust the combustion process to varying heat demands, resulting in lower emissions.

Safety features are also paramount in the QHT Boiler’s design. It includes multiple safety mechanisms such as pressure relief valves and flame detection sensors to ensure safe operation. These features provide peace of mind to users, knowing that the boiler operates within safe parameters.

In summary, the QHT Boiler represents a fusion of efficiency, advanced technology, and user-friendly design, making it a top choice for heating solutions. With its compact size, high-efficiency rating, innovative control systems, and commitment to sustainability, the QHT Boiler stands out as a modern solution for diverse heating needs. Whether for residential or commercial use, it meets the demands of today’s energy-conscious consumers.
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