A low water cutoff is required when the boiler input is less than 400,000 Btuh and which condition is present?

A low water cutoff is required when the boiler input is less than 400,000 Btuh and which condition is present?

• A. The circulating system is below the lowest safe permissible water level
• B. The circulating system is below the highest safe permissible water level
• C. The boiler has a manual reset control
• D. The venting system is blocked

Answer: (B)