Burnham Alpine ALP150B vs Weil-McLain ECO Tec 150-H

Both boilers peak at 150 MBH maximum input with a 95.0% AFUE rating on natural gas or propane, and their heating capacities align closely: the Alpine ALP150B documents a 136 MBH DOE heating capacity and a 118 MBH net AHRI rating, while the ECO Tec 150-H documents 139 MBH DOE output and a 121 MBH net AHRI rating. At the net figure the two are within 3 MBH of each other, so neither has a meaningful sizing advantage.

Mounting is the cleaner differentiator: U.S. Boiler lists the Alpine as wall-hung or floor-standing at 182 lb shipping weight with 1" FPT water connections, while Weil-McLain's ECO Tec 150-H is a wall-hung boiler weighing 117 lb with 1" NPT male connections. A project with floor space and no strong wall can use the Alpine's floor option; a tight wall application favors the lighter ECO Tec.

Venting and gas hookups round out the comparison: the Alpine installs in 3" CPVC/PVC to 135 feet of intake and 100 feet of vent, while the ECO Tec vents 2" or 3" to 100 feet per the manufacturer, and both take 1/2" gas (FPT on the Alpine, NPT male on the ECO Tec). Both are heating-only units that pair with an indirect tank, and both are sized from a room-by-room heat-loss calculation.