My rain water from the greenhouse roof comes inside into my storage tank
,which i then pump into a 240 litre barrel and then add my fertilizer.This
is near enough ambient with the greenhouse .I have never had any
problems.You could also place the storage barrel near your greenhouse heater
if you have one to help.
Thanks Keith
"Wendy7" wrote in message
...
I once had a 55gal drum with a submersible pump in the g/h, that I used for
RO water storage.
The water was a bit warmer than the tap water. My pump packed in after
more than 5 years.
I decided not to replace it as I stopped the RO (too wasteful), however it
was useful to mix my 1/4
strength fertilizer in.
Cheers Wendy

"Insight News" wrote in message
m...
I just put in a 9x12 greenhouse. Water is plumbed directly inside with a
dual carbon filtration system. I usually water with a spray wand, but it
seems like the ground water temps in January are going to be too cold to
be practical. How does everyone deal with water temps during the winter?

I am using two 55 gallon plastic barrels as a solar heat sink. I am
thinking about using one of these as my source for plant water, and would
just refill with ground water. Thoughts?