Specifications include, but are not limited to: The gas-fired hot water condensing heating boiler shall be fabricated of high grade stainless steel (SA240). The heat exchanger shall utilize the Inox-Crossal heating surface for maximum heat transfer for optimum energy savings. The smooth, non-fin heat exchanger surfaces shall provide a self-cleaning effect while promoting clean combustion through low heat exchanger loading and a straight-through design. The boiler shall be capable of operating at less than 20 PPM NOx (@ 3% O2) in natural gas operation throughout the firing range. Each boiler shall be equipped with 2 modulating pre-mix cylindrical stainless steel gas burners with a high-alloy stainless steel surface capable of operating with consistently high efficiency, and wide operating modulation range. The burner shall be equipped with a variable speed combustion fan for quiet and economical operation. The burner shall include a combustion control system containing a broadband oxygen sensor and modulating gas valve to automatically adjust combustion for optimum performance. The boiler control shall be a 7 inch (175 mm) full colour display with touch screen operation. The boiler shall be equipped with a WiFi communication module for remote connection. The boiler shall be capable of operating as a single boiler control with outdoor reset capabilities or shall be cascadable as part of a multi-boiler system to a maximum of 16 boilers using CanBUS integrated communication protocol for boiler set point operation without the requirement for a separate stand-alone cascade controller
