Condensing boilers can be a highly efficient means of generating and circulating heat, as they recover latent heat from water produced during combustion and minimize cycling losses. Figure 1 illustrates the relationship between heating-water return temperature (HWRT) and boiler efficiency. Low HWRT is required for high efficiency. This article will discuss how low HWRT can be achieved with industrial-grade pressure-independent control. By optimizing heat-transfer performance at ...
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