Replacement Boiler Sizing Chart

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Type of System

Steam Forced Hot Water Gravity Hot Water

Type of Fuel

Natural Gas Oil Other

Brand Name of Present Boiler
Model No.
Boiler Input	BTUH
Square Feet of Radiation
Output (Heating Capacity)	BTUH

STANDING RADIATION BASEBOARD RADIATION ROOM SQUARE FT. X PER SECTION (From Chart on Page) NUMBER OF = SECTIONS RADIATION IN SQUARE FEET LINEAL FEET (Length of Finned Tube Only) Total Square Feet of Radiation   Total Lineal Feet. x Conversion Factor (see below)   x 600 BTU/FT. Total BTUH Load

Boiler Model Recommended
Input
Heating Capacity

(should be equal to or slightly greater than load)

CONVERSION FACTORS
One sq. ft. of steam radiation = 240 Net Btuh
One sq. ft. of forced hot water = 185 Net Btuh at 190° F

RADIATION TABLES

Cast Iron Radiators
The output of a radiator is measured in square feet of radiation. To determine the number of square feet of radiation in a radiator:

COLUMN TYPE RADIATORS

TUBE TYPE RADIATORS

WALL TYPE RADIATORS

Wall radiators are measured by their height, length and thickness. The following table shows the number of square feet of heating surface per section: