What’s the best way to heat my giant paddling pool?

[TimeGoesBySoSlowlyForThoseWhoWait]

Currently cloudy with intermittent sun but around 30’. Will it heat up quicker if I leave it to the sun or put the plastic tarpaulin type cover over the top?

You need to use a solar cover (the same size as the pool) which floats on the surface of the water. They look like stiff bubble wrap.

Put hot water in it…?

Bubble wrap! Cut it to size and leave on top

Why would you heat it up when it's 30 degrees? Surely the point of a paddling pool is to cool down. Or am I missing something here

Boil the kettle and tip it in?

Float black bin bags on the surface of the water

Do you need to heat it up or keep it warm.
You could do the black bags, or a solar cover if the latter.
With the former I usually found the quicker and cheapest way was to drain it down a bit and hose in some hot water from the kitchen tap. Eventually I got a hot water tap put outside which also came in handy for washing down muddy dogs.

Fill it with a hose from the kitchen tap at the temp you want. When it gets too cold add hot to it.

I know the need to put hot water in it, but it’s a lot of back and forth and the kitchen tap does look like I can,t attach a hose attachment to it due to its shape, so looking at dodgy heaters on Amazon that look like the start of a horror/mirdr film when you want to electrocute someone.
maybe we just need to get an inflatable hot tub! But they seem so grim of not fully filtered