This could be down to a faulty part like a failed heater, circulation pump or thermostat, or even simply that there is not enough water in the Hot Tub.
Taken from the Hot Tubs FAQ at http://www.hottubsbarn.co.uk/
Yes
Kids can get scalded by the hot water in the "HOT TUB".
Very young children should not be in a hot tub at all, older children can safely be in a hot tub for about 10 minutes. Make sure they drink plenty of fluids before and after going in the tub.
Only if you stay in there for too long.
Children, pregnant women, people with heart conditions should never go into a hot tub. Healthy adults should only stay in for 5-8 minutes. The longer you stay in, the more dangerous it gets.
THE HOT TUB IS TO RELAX
You use a hot tub cover after the hot tub has cooled off. Using it while your hot tub is still warm can cause your cover to break.
What about "pool chemicals in a hot tub"?
for a luxury hot tub it is 15,000
Hot tub covers can have long lives if they are cared for properly. Hot tub covers are mostly affected by dirt and sunlight so keep it clean and perhaps put a tarp over it if the hot tub is in direct sunlight.
Hot tub cover prices usually depend on the type of hot tub that you own. Hot tub cover prices can range between $100 to $400. It also depends on your income to decide if a hot tub cover is too expensive.
A hot tub is just that a tub of hot water thus, the need for a heater. To reek the benefits and pleasures of owning a hot tub a heater is an essential element to the experience.