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All our air to water heat pump installations require buffer tanks and it is also a common option to pre-heat domestic hot water using indirect tanks. Traditionally buffer tanks for closed-loop hydronic installations are made from carbon steel while indirect tanks used for potable water are made from stainless steel. The larger the tanks or more coils they contain the higher the price - something that was driving the cost of installations higher than we would like to see. The solution was designing and bringing in our own competitively priced line of 316L stainless steel water tanks, starting with 80 & 200 USG 4 port buffer tanks and double coil 120 USG indirect tanks.