I recently had my old, broken furnace replaced with a high-efficiency condensing furnace. One function of this furnace is that it extracts enough heat from the exhaust gases to condense them into liquid ("condensate"), which is sent out of the furnace and down the drain.
My understanding is that this liquid is mostly water. I'd like to use this to reduce my water usage, rather than letting it go down the drain. Is furnace condensate safe to use on my houseplants? If not, is there something else I could safely use the condensate for?