3010207c__Apricus_vs_Hills___ClearChain__Difference
[Hills] Stainless Steel [Apricus] Stainless Steel or Glass Lined [Comment] As from: http://www.ata.org.au/forums/topic/apricus-or-hills-evacuated-tube-solar-hw-system “3. The tanks used in the market by Apricus are Everlast (stainless steel) or Aquamax.. Hills use Everlast tanks too. They are both made in Australia. Stainless steel is a quality choice but more expensive. It is not suitable for all areas those as certain type of water, particularly bore, will quickly corrode stainless steel. The warranty policy of Everlast provides details of that. Vitreous enamel (aka glass lined) tanks don’t generally last as long as SS tanks as they are protected by a sacrificial magnesium anode which corrodes instead of the steel. The problem is that hardly anybody actually replaces the anode, which you should do once every 3-4 years (depending on water quality). If you DO replace the anode the tank could last 10+ years.“ [Difference] 
Tank Choice
Solar Hot Water - Evacuated Tubes - Apricus vs Hills - ClearChain
Difference