Brewpub Systems The ABT 3.5-barrel/4-hectoliter Electric-Heated Brewing System Get the Flash Player to see this rotator. 3.5-barrel/4-hectoliter ABT Stainless Steel Brewhouse Hopcat Brewpub - Grand Rapids, Michigan USA Available with either solid copper brewhouse vessels (shown above) or polished stainless steel. Skid-mounted brewhouse with pre-plumbed stainless steel hard piping for quick and easy installation. Click here for system specifications Click here for brewhouse photographs Click here for brewhouse drawings