Heating up a hot tub is a crucial aspect of owning and using one. However, the heating time for a hot tub varies based on several factors, including the tub’s size, the temperature of the water source, ambient temperature, and the type of heating system (electric vs gas). Most hot tubs are set to 100-104 degrees depending on user preference.
One of the most significant factors in determining how long it takes to heat a hot tub is its size. A larger hot tub will naturally take longer to heat than a smaller one, as it requires more water to be heated. Most hot tubs have a capacity ranging from 200-500 gallons (swim spas can be 1500-2000 gallons), with smaller tubs taking about a few hours to heat up, while larger ones can take up to 24 hours especially if they are 110v units (110v units have a smaller, 1 kW heater). It’s important to note that most larger hot tubs come equipped with higher kilowatt heating elements (220v power with 4-5 kW heaters).
Another essential factor that affects the heating time of a hot tub is the temperature of the water source. In cold weather conditions, the temperature of the water source may be lower, meaning that it will take longer for the hot tub to reach the desired temperature. Coupled with water source temperature is the ambient, outside temperature (30 degree day versus a 80 degree day). To speed up the process, some hot tub owners will fill their tubs with hot water from their home’s hot water supply. Either way, ambient temperature and water source temperature can be determining factors in heat up time.
The type of heating system installed in a hot tub also plays a significant role in how long it takes to heat up. The two most common heating systems for hot tubs are electric and gas. Electric heating systems are typically slower than gas heaters, taking several hours to heat the water to the desired temperature. Also important for electric heaters is the draw of the heater. Some electric hot tubs have a 110v connection which can only power a 1 kW heater versus a 220v connection (hardwired) which can power up to a 4-5 kw heater. Larger heaters that can draw more power get hotter which allows them to heat the water faster. Electric heaters take between 8 hours and 24 hours to heat up depending on ambient temp, water source temp, and size of heater. Gas heaters, on the other hand, can heat up a hot tub in a matter of an hour, making them the preferred option for those who want to use their hot tub on short notice.
It’s important to note that while the heating time of a hot tub can vary, there are steps you can take to ensure that your hot tub heats up as quickly as possible. One critical step is to make sure that the hot tub cover is put on and securely in place. A well-fitted cover helps retain heat and prevents cold air from getting in, making it easier for the heater to maintain the desired temperature.
In short, the heating time for a hot tub varies based on several factors, including the tub’s size, the temperature of the water source, ambient temperature, and the type of heating system.
For more information visit our hot tub buyer’s guide pages. Also, click on the pink boxes and complete our free local quote form to get competitive prices from local dealers in your area. Or click our “Spa Buyer’s Consult” link above to get one on one expert advice on the best swim spas available in your area.