The Quinta Ace is a market-leading series of high-efficiency wall hung condensing boilers with low NOx The Quinta Ace wall hung boilers are suitable for use on both sealed and open-vented (excluding the Quinta Ace 135 & 160) installations and are perfect for both new and retrofit installations. Available in 30, 45, 55, 65, 90, 115, 135 and 160kW models.