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View and Download Weil-McLain ULTRA ULTRA-105 service manual online. Gas-fired Water boiler Series 1 & 2. ULTRA ULTRA-105 boiler pdf manual download. Boiler Manual. Gas-fired water boilers – Series 3. Featuring. Flexibility. ®. This manual must only be used by a qualified heating installer/service Follow the boiler manual instructions to clean the system manual. Vent / air pipe size options (PVC sizes):. Ultra-80, 105: 2" or 3”. Ultra-155: 3".3. Blower. The advanced blower design and air inlet silencer on Ultra boilers result in very quiet operation. Models Ultra-80 & 105 — Air enters the boiler