Purchasing Energy-Efficient Large Commercial Boilers ...

A minimum turndown ratio of 5:1 is recommended for gas-fired hot-water boilers. This is particularly important in condensing boilers that run more efficiently at part load. Low mass: Because boilers cycle on and off and it takes time to bring a high-mass up to operating temperature using low-mass will reduce consumption. In addition some can be brought online quickly therefore avoiding the need to keep a

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Energy Cost Savings Calculator for Commercial Boilers ...

Base model - Values represent a 1000000 Btu/hour gas-fired hot-water boiler operated for 1500 full-load hours per year with a thermal efficiency of 80%. The performance of this standard unit is based on ASHRAE 90.1-2007. Thermal (E t) - Represents a 's output divided by input as defined by ANSI Z21.13. A 's thermal rating should be used to ...

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