Depends on the size, the type of heating element, the water temperature and the ambient air temperature. I used to have a 300 gallon hot tub with a big natural gas heater; it took about 3 hours from "stone cold" to "102 degrees". I now have a 200 gallon tub with a small electrical heater; from 40 degrees to 102 degrees now takes about 20 hours.
Depends on what temp the water starts at and how hot you are expecting it to get. It will also depend on how powerful your heating element is for the hot tub. Typically you can expect about 1-2 degrees an hour. Within 24 hours a 500 gallon tub is typically hot! Leave the cover on the tub when heating it up. If you leave the cover off, a lot of heat can escape.
It takes about 3 days
It depends on how slow you are
A hot tub heat is transferred by convection. Most hot tubs use forced convection while the hot tub pump circulates the water.
It is about £60 a- day but it all depends on what climate the tub is in and how hot you heat it to :) easy!
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.
Heat and dehydration. You risk heat stroke and death.
If you heat it enough it will. However, in normal operation, a hot tub does not actually boil water; the bubbles are mainly air.
Generally most hot tub heaters reach a maximum of 104 degrees Fahrenheit. Hot tub heaters are regulated to prevent excessive heat from harming our bodies. The following is a website that has a lot of detail about hot tub heaters. http://www.ehow.com/about_5031765_temperature-should-hot-tub.html
The average-size hot tub holds approximately 475 gallons of water. The earliest known hot tubs were calderas. Hot stones were used to heat the water.
No, but hot tub folliculitis can be caused by hot tubs. See your health care provider for advice specific to your situation.
If you take proper care of your hot tub cover it should last for the life of the hot tub. For more information visit http://www.greatnorthernhottubs.com/faq.html.