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The Parker tube bundle is extremely flexible and offers a long life with a 20 year warranty against thermal shock. No Parker Boiler has ever been known to experience an internal explosion. A large amount of heating surface provides increased efficiency and minimizes chances of scaling. The Atmospheric Burner System, control system and the entire boiler are furnished so that it is simple to operate by regular personnel. Simplicity is a decided advantage as there are no expensive blowers, complicated controls, or burner adjustments, as is necessary on many boilers. Parker tubes are 1" O.D. Grade SA-53 sprial tubes, welded in headers with no internal fittings exposed to the heat area. Tubes are furnished in complete sets that are easy and inexpensive to replace. All tubes are flexibly arranged to permit free expansion and contraction to eliminate the warping or leaking, typical of rigid construction.