Using hot water from water tank?

So what would people’s thoughts be on using some hot water from hot tap to bring the cold water up to temp?

What are your methods for heating the feeding solution?

Depending on the volume I sit one jug inside another of hot water or add boiling water to bring the temp up to 20C⁰ ±

I like these titanium aquarium heaters the best. This brand has worked flawlessly, since upgrading from glass tube kind a few years ago. I still use those too, but yeah. These can be tossed around and plunked into containers without worrying about cracking any glass.

Can buy them with or without the temp controller, for whatever size res. The 200w works good all around, up to 80+ gallons I know for sure.. If you do use your own digi temp controller, make sure to use a probe that is actually rated for aquarium use. The cheap universal metal ended temp probes that come with a lot of controllers eventually corrode or start leaking when submersed for so long, and go haywire after some point. Can cause over or under heating issues when you least expect, especially if using it to keep a res warm 24/7.

I'm guilty of using tap from the hot water tank to shower or bath jugs around the house when needed, but out in the grow op I don't have that luxury, so I have to use other methods. Most those aquarium heaters will warm up a cold bucket of water or nutrient solution pretty quick. I also got one of those fancy 1000w electric kettles that will boil almost 2 liters of water in a few minutes, very efficiently. Or, the old set a bucket on top the radiant oil heater and hope it doesn't fall over trick..

A couple of other things i do to take the chill off.
In my flower tent I've a 6/7ltr bucket getting topped up via a stop cock from the reservior that supplies the dtw pump, the idea is after feeding the nutrient tops up automatically and gets a chance to warm up being inside the tent.

For my clone tent I've a old 5ltr formulex tub I fill and leave it inside the veg tent to keep the chill of the nutrient.

He said stop cock. A huhuhuh
Yayayaya. Cock! Booooiiing!