My father had an engineer friend who liked carbonated water so much that he installed a CO2 tank and connected it to a pipe.
Unfortunately, he connected it to the pipe to the toilet!
Wow. That sort of engineering is just plain scary. Wonder what other interesting things he's bequeathed to mankind!
When I built my current greenhouse, I installed a tankless water heater and mixing valve to provide tempered water for watering. The secondary benefit is as a backup heating system if I suffer an electric or heater failure in winter. I can crank the mixing valve to hot and spray hot water through several Fog-it misting nozzles (in the aisles, not on the plants). In general, orchids are not happy with 40 degree water(unless the alternative is freezing).
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not crazy at all ...my grandfather would not use well water to water the vegatable garden in summer but instead ran a pipe from the little creek nearby and had a pum in it for the garden ....cold water shocks
I use warm water in the winter, but when I put them outside in the greenhouse for the summer I use water from my koi pond. It is always warmer then the air.