Before you begin please read disclaimer: The Raypak, Inc. SureSpec 4.0.0 web-based sizing application is a tool that can be used to estimate heating requirements for many common domestic hot water system types. It is not intended for use on hydronic systems or pool systems. SureSpec4 is intended to assist in selecting water heaters that best meet the specific job requirements. It is the sole responsibility of the system designer to select the correct products needed for the specific application. Raypak, Inc. reserves the right to make changes to SureSpec4 without notice.
For hydronic system sizing, contact an engineer or HVAC supplier.
For pool heat pump sizing, see Heat Pump Sizing click here
For gas-fired pool heater sizing, contact your local Raypak representative.