• Single-wall full throat 1-1/2" diameter internal coil heat exchanger
• Factory installed aquastat on all models
• Factory installed temperature and pressure relief valve and brass drain valve
• Robust construction - inner tank is precision built from high quality steel and repetitive pressure testing assures the highest quality
• All steel construction with an environmentally-friendly powder coat finish providing a tough and attractive exterior
• Cobalt-enriched porcelain enamel glass lined tank and coil are highly resistant to aggressive water not susceptible to damage due to the presence of chloride in the water
• Ecomate insulation does not contribute to global warming
• Two magnesium anode rods - inhibit corrosion and maximize tank life. Electrolysis attacks the anode rods, not the tank
• Factory installed dielectric nipples on boiler connections - provides greater insulating protection

bock water heaters 40sk