Burnham Commercial Cast Iron -

Click here to see how a local Maryland City is cutting their fuel consumption and becoming more "green" by using the MPC

MPC (Multi-Pass Commercial)

Burnham’s newest boiler, the MPC, Multi-Pass Commercial Boiler is loaded with innovative features that are unsurpassed by any other boiler in the industry. Take a close look at the MPC and there is no question that it is setting the new standard for USA-made commercial cast iron boilers.

A multi-pass boiler operates differently than other more conventional cast iron boilers, also known as single or double-pass boilers. A multi-pass boiler, such as the MPC directs flue gasses through multiple combustion chamber passes, extracting the maximum amount of heat out of the hot boiler flue gases. With single or double-pass boilers, the burner fires into a combustion chamber, then the hot flue gases pass upward between the sections (usually through a pinned or baffled flueway) and out into the venting. The MPC directs flue gases into several smaller passes which allows the sections to absorb more heat than if the flue gases just passed through the boiler sections one time.

The MPC incorporates features such as a return water mixing tube, which distributes water evenly throughout the entire section assembly. Distributing cool return water eliminates areas of extreme hot and cold, which can cause undue stress on the boiler castings. Some boilers require special piping, electronic controls, and mixing valves or circulators to control the return water temperature but thanks to the return water mixing tube, protection is built-in to the MPC, which reduces installation time and saves money.

The centrally located supply and return connections simplify piping and wiring of controls for faster installations. A wiring chase way runs from the supply and return manifolds at the rear of the boiler, underneath the jacket, to the front of the boiler. This eliminates the need for running external conduit through the boiler room and makes for a clean, professional finished appearance.
A 4-inch thick blanket of insulation surrounding the sections traps heat within the boiler jacket which means a cooler boiler room for the installing and service contractor and more efficient operation for the building owner.

The MPC is also available with Burnham’s newest control, the SBC™ (Sage Boiler Control), which provides complete boiler control capability at the fraction of the price of a comparable system. The SBC is a combination operating, and staging control that will control up to 8 fully modulating boilers and is available as a factory-wired package installed in any Power Flame C Series, Full Mod burner, with an RM7897A or better Honeywell flame safeguard. The Sage can save you money by reducing installation time and the reducing the number of controls required to control your boiler. The Sage will also save money by firing the boiler(s) at the precise rate of modulation to meet the building load while limiting short-cycling.

A combination of tongue-and-groove construction, and a silicone-coated fiberglass rope gasket provides the gas-tight seal necessary for a forced draft boiler to operate safely and efficiently. Burnham engineers tested a variety of sealing methods before deciding on the silicone-coated fiberglass rope because it obtained the best seal and was clean and quick to install. Unlike other sealing materials that were tested, the fiberglass rope does not break down over time from exposure to heat and products of combustion. It is also very clean to work with and flexible enough to seal every area of the combustion chamber grooves.

Burnham Commercial builds every boiler to the highest standards of safety and quality. ASME Section IV requires that pressurized heating boilers must be built to strict safety standards. The MPC boiler has undergone rigorous UL (Underwriter’s Laboratory) testing in order to be UL certified in the USA and Canada. The MPC is the only USA made boiler to have this approval on the complete boiler/burner package. For details regarding the UL certification and exceptions, contact your local Burnham Commercial representative.

The MPC was designed from scratch to be unlike any other conventional boiler. Early in the design process Burnham made a commitment to designing and machining the MPC to the highest quality. To execute this high level of quality Burnham invested in a brand new state-of-the-art CNC machining center. This new machining center will hold tolerances to within .001 inches (approximately ¼ the width of a sheet of #20 copy paper). Because the CNC machine does all the work, the operator is able to perform a 100% inspection on every casting in between loading and unloading the machine.