Glasshouse (» DURABLE AND HIGH EFFICIENT (+ BEYS TO INSTALL AND SERVICE (> MADE WITH WILE-McL AIM QUALITY APPLICATIONS INCLUDE: Residential Light Commercial Multiple Boilers Indirect-fired Water Healing a And Much Mare WILE-McLAIN te EG Wei-Molain Series b Water or Sle. With Thankless Heater Notion Natural Draft NATL MBH: 75-209 Bui EIT 83% Nat Load Range Hot Water 55,000 to 217.