Rheem’s Professional Prestige combination boiler is the latest innovation to the company’s high-efficiency tankless gas water heater lineup. 

If you have a steam boiler you’re also going to have a pressuretrol.

An installer pipes up the system shown in Figure 1. Its purpose is to provide two zones of space heating.  

The first course, Installing High Efficiency Boilers, was released April 6, followed by sessions for venting high efficiency boilers and primary/secondary piping. 

The NFB-C is available in two sizes: NFB-301C (301 MBH) and NFB-399C (399 MBH).

Weil-McLain’s Stainless Steel Vertical Firetube (SVF) boiler features thermal efficiency up to 97.1%, easy installation and maintenance, the intuitive and user-friendly Unity control system, and Weil-McLain boiler design reliability and longevity, the company says.

The MagnaTherm FT condensing boiler is available in 1,000, 1,500, 2,000 and 3,000 MBH sizes with up to 20:1 turndown. 

The A. O. Smith ProLine XE combination boiler’s service-friendly compact design offers professional contractors easy installation, setup and maintenance, delivering immediate hot water and comfortable space heating for homes. 

The CREST condensing boiler upgrade provides up to 96% thermal efficiency in six models ranging from 2.5 MBtu/h to 6 MBtu/h. 

The XVers L is built to automatically assess the temperature and adjust to make sure the environment is controlled and comfortable.