Stiebel Eltron SBB 400 Plus solar storage tank with dual internal heat exchangers. Storage capacity 108.6 gallons (411 liters). 1" BSPP pipe connections, NPT adapters for sweat copper provided. Excellent choice for single tank systems with boiler backup, or for injecting solar heat into a heating system. 10 year warranty. Tanks generally drop ship from manufacturer, please contact Sun Source for shipping information.