Condensate neutralizers are installed in residential homes and commercial buildings in which condensing gas-fired appliances – such as boilers, water heaters, and furnaces – are installed. All new high-efficiency, gas-fired appliances have a drain line connection and all of these installations should include a neutralizer. The neutralizer should be installed between the appliance and the drain, before the condensate pump, if possible. Not all systems will have a condensate pump. If you have an installed appliance that does not have a neutralizer, contact your plumbing or heating contractor to request that one be installed.