Browse categories of Deaerators for wall-hanging boiler systems Technopolymer deaerators Accessories for deaerators The under-boiler deaerator separates and removes the air circulating within the closed circuits of wall-mounted boiler systems. Technopolymer deaerators DISCALSLIM®, Deaerator. DISCALSLIM®, Deaerator. Accessories for deaerators Insulation for deaerators DISCALSLIM® 551 series.