The Bosch greenstar boiler represents today's best efficiency technologies brought together in a single package. Astounding efficiency ratings can be achieved with the use of Bosch's condensing technology, squeezing every last BTU out of your home's gas supply. An included 3-speed Grundfos pump and a wide variety of pipe venting options allow the boiler to be installed in nearly any home imaginable. This boiler includes a domestic hot water coil, allowing the boiler to act as a tankless hot water heater as well as a hydronic boiler.
Condensing Technology Improves Efficiency
The ZWB42-3 is a condensing boiler, using the leftover energy in the boiler's flue exhaust to further heat your home. Keep your home warmer for less energy cost!
Included DHW Coil
This Bosch greenstar boiler contains an internal domestic hot water coil. This allows the boiler to function as a tankless hot water heater as well as a hydronic water boiler.
Fully Modulating Fan
The boiler includes a fully modulating fan to control the boiler's burning rate, allowing optimum efficiency to be achieved during a wide variety of outdoor conditions.
Small Size and Low Installation Clearances
Low installation clearances on all sides, wall mounting configuration, and small footprint translate into a boiler that can be installed almost anywhere.