The Vitodens 200 from Viessmann is an energy-efficient, wall-mounted, gas-fired condensing boiler. Key features include a 316TI stainlesss-steel heat exchanger for a longer life expectancy; simple control of three different temperature heating circuits and up to four pumps, ideal for mutiple radiant heating applications; DHW control with priority; and optional solar control module for DHW and central heating backup. Add multiple boiler prepiped manifolds for commercial applications up to eight boilers.