Series 142 Process Boiler Water Feeders are used in heating applications on pressing machines when direct feed through the float chamber is permissible. The water pressure must be at least 10psi (68.9 kPa) higher than steam pressure. Series 142 is ideal for use in pressing machines and other small process boilers. Available in Model 142S with strainer. Maximum Water Pressure: 125psi (8.6 bar), Maximum Steam Pressure: 100psi (6.9 bar).