Every miniature boiler shall be provided with at least one feed pump or other mechanical feeding device except where the following conditions exist:
Each miniature boiler shall be fitted with a feedwater connection which shall not be less than one-half inch pipe size for iron or steel pipe and one quarter inch for brass or copper pipe. The feed piping shall be provided with a check valve near the boiler and a valve or cock between the check valve and the boiler. Feed water may be introduced through the blow-off connection if desired. Feed water shall not be introduced through the water column or gage glass connections while the boiler is under pressure.
Conn. Agencies Regs. § 29-232-75