Unlike traditional non-condensing models, condensing technology captures heat from the exhaust gas and uses it to preheat the incoming cold water. This increases efficiency and reduces emissions -- well ahead of the 2012 Low NOX emissions standards set by SCAQMD (California -- South Coast Air Quality Management District).
The Bosch Integra 500 features an electronic ignition system and can vent through either 3 inch or 4 inch diameter PVC vent pipe either through the side wall or up through the roof. A concentric venting option is available.
The Bosch Integra 500 comes with built-in Freeze Protection and is the same as the Bosch Therm C 1050 ES tankless water heater except that it also comes with a 3/4" PRV and an External Water Filter. The Integra 500 has a white cover and the Bosch C 1050ES has a silver cover. Both heaters are 199,000 BTUs and have the same temperture rise.
The Bosch C800ES is the same as the Bosch Integra 500 and the Bosch Therm C 1050 ES tankless water heater except that it comes with a 3/4" PRV and it does not come with built-in freeze protection. The External Water Filter is optional, but recommended. The freeze prevention kit is designed to provide protection for the water heater down to approximately 5°F for short term conditions only. It will not protect the appliance in areas where the temperature is routinely expected to be below freezing. The freeze prevention kit will not protect plumbing outside the appliance from freezing.
The Bosch Integra 500 comes with a limited 15 year warranty on the heat exchanger and 5 years on all other parts. Service and labor costs are not covered.
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