Question about filling fishy pool

[callieollie]

I'm almost 37 weeks and had my first two at 38 weeks so I'm starting to feel like this baby could come any day now.  I'm guessing I should turn up the water heater so that it can be hotter than usual for the birth. My question is - do you fill it up with the hottest water possible and then just wen it runs out let the rest fill with cold water to bring it to a nice 99-100 degree temp or do you start with cold water and fill that to a certain point (and if so, how much?) and then switch to hot water? I'd read that you shouldn't do straight hot water at first because it could melt/damage the plastic of the fishy pool. What do you recommend or what did you do?

[XanaduMama]

Is it a tank water heater, or an on-demand system? If you've got a tank, I would put a little cold in the bottom, then fill up with hot. You may need to add more hot at the end (we did, but I overdid the initial cold run) from a kettle or pots on the stove or something, but that's pretty typical.

If it's on-demand, then just run the whole pool-full at your optimal temperature.