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How much does it cost to run a Hot Tub?

It’s hard to tell you exactly how much your hot tub is likely to cost to run.This is because there are lots of different factors that affect running costs, for example. Regularity of use; ambient temperatures ; electrical tariff ; location of the hot tub. To name just a few, but what Hot Tub you choose to buy will make a difference in running costs.

You may see claims from some companies of “90p per day” but this is likely being calculated purely on just the cost of keeping the water hot, without considering initial start-ups and running any of the jet pumps. This can be a little misleading because if you want to use the hot tub your running costs will obviously exceed this and is impossible to determine the exact cost without knowing how often the hot tub will be used.

Therefore, we’d rather have a more honest conversation with you pre-sale that doesn’t leave you confused about your running costs later on down the line. This can mean your weekly running cost can be anywhere between £10-£20 per week dependent on usage and other factors as described above.

Try to avoid the cheap hot tubs advertised on the internet with little or no insulation or you will find that the daily running costs will outweigh any savings in the initial cost of your Hot Tub.

How long does it take for a hot tub to heat up?

This varies depending on heater size, flow, size of the hot tub, ambient temperature and quality of insulation. Generally speaking, a hot tub will warm up 1 degree per hour.

What should I do with the hot tub temperature when I go away?

It is worth reducing the hot tub temperature to save money on heating costs and potentially cut chemical consumption. Most hot tubs have freeze protection so there is limited risk of freezing in the winter if you do this.

My hot tub will not reduce in temperature, what should I do?

In the heat of summer, sometimes the ambient temperature means that the hot tub temperature is very hard to reduce. The best thing to do is either partially drain and add cold fresh water to reduce the temperature or to leave the cover off for a period to bring this down.


What Temperature Should a Hot Tub Be?

Most hot tubs can go as low as 26°C and as usually always have a maximum temperature of 40°C for safety reasons. The only time you may consider going as low as 26 degrees would be in the heat of summer if you wanted to use the hot tub to cool off. On the flip side 40 degrees is very hot and can be unbearable for some users. The quick answer to ‘how hot should my hot tub be?’ is between 37°C-40°C to ensure you enjoy the maximum benefit that hot water provides.

Electrical Requirements - What do I need?

Hot tubs require different power supplies depending on how much power they individually draw. The pumps, lights, heaters and all the other electrical components require power to perform their jobs correctly. If the correct amperage of electrical supply is not installed, then your hot tub may attempt to draw too much power from the electrical source. This could cause an overload of the circuit and if this happens then the power could trip, and your hot tub could turn off.

Making sure that you install the correct electrical supply is also a safety requirement. If you install a much higher supply than you need then it will never trip. Tripping can occur as a result of, or to indicate a fault. Therefore, you need to install the correct power supply to ensure that, if necessary, the hot tub is capable of tripping the power.

The power supply you need will entirely depend on what hot tub you are getting. So please provide as much information as possible regarding your household electrics and if you have any limitations to your electrical supply, you should let us know to help narrow your options.

Hot tubs usually fall into two categories, one being “Plug In & Go” 13-amp and the other, 32-amp.

“Plug In & Go” Hot Tubs

“Plug In & Go” Hot Tubs require a minimum 13-amp supply. Usually this can be facilitated by an outdoor waterproof socket. If the model you are purchasing has an in-line RCD then this will be adequate, if not you will require a separate plug. The outdoor plug needs to be within 1.5m to 4m of the location of the hot tub, with a maximum distance of 5m. All our 13-amp hot tubs are supplied with a 2m electric cable free of charge. 2m to 5m Hi–Tuff cables with an inline RCD are available for only £99.

32-amp Hot Tubs

32-amp Hot Tubs require the electrics to be “hard-wired “on its own fused spur back to your household consumer unit, separate from the supply for any other appliances. If you require “hard-wired“electrics, we can provide an electrical package that can be purchased along with your hot tub from only £499. This price is designed as a service facility for our customers (subject to a free site survey).

If you wish to use your own electrician, then please read the requirements below:

The hot tub should be protected by a sufficiently rated MCB (mains circuit breaker) and should cover the maximum amperage pull of the Spa plus 25% to allow for brake torque (i.e. the extra rush of current when pumps are first started). It should also be protected against earth faults by an RCD (Residual Current Device).

For a 32-amp hot tub, 6mm² 3-core SWA cable is needed and a 10mm² 3-core SWA cable is perfectly suitable for a 40-amp Hot Tub. The electrician will calculate the size of cable required depending on the loading and the distance from the mains supply.

From the consumer unit you should have suitable armoured cable or cable protected by a suitable conduit to a suitable waterproof outdoor isolator switch 2 or 3 metres from the tub so that bathers cannot be in the hot tub whilst touching the switch. (An IP65 45AMP Rotary Isolator Switch is recommended so that the hot tub can be isolated outdoors in an emergency or for service work – this is simply a rotary on/off switch).

From the isolator switch there needs to be enough cable left to reach the furthest away corner of hot tub so that the engineer can connect the tub to the electrical supply.

Once the hot tub is filled with water and the electrical supply is installed, our installation team will commission the hot tub and check that everything is fully operational before handing it over to you.

For any further enquiries call our team on 01227 931128 or email

What extras do I need?

There are no extras needed when you buy a Hot Tub from Johnsons Hot Tub Outlet, we include a Chemical Starter Pack complete with an Insulated cover.

Everything you need to get you started in your Hot Tub Heaven

You may prefer to add two tread steps or a cover lifter to your order or any of the other accessories that we stock.

Is there a difference between a spa and a hot tub?

Essentially there is no difference; they are different names for the same product/design. A swim spa is different altogether. Think of it as an aqua treadmill; it is an excellent and effective way to exercise and is great fun for all the family. Some people think that Jacuzzi is a type of hot tub whereas it is really a brand of hot tubs.

Why are your hot tubs more reasonably priced than others on the market?

We simply cut out the middleman. Our big buying power this enables us to offer great deals and service.

With multiple showrooms we can negotiate the best prices and then pass this savings direct onto you the customer.

As part of our on-going commitment to competitive pricing we always buy direct from the manufacturer.

Should I leave my Hot Tub on all the Time?

Yes, you should leave your hot tub on all of the time. Hot tubs are designed to always be switched on and it’s more economical to keep the water hot than it is to heat it up from cold each time you want to use it.

The main reason is that it takes a relatively small amount of electricity to keep your hot tub going once it has reached the correct temperature. This is particularly true in the summer if you have a good quality cover and if your hot tub has a high level of insulation. In fact, it’s possible that your hot tub will use very little energy in this situation.

However, the colder the ambient temperature is the more energy it will use to keep hot. Also, if your hot tub hasn’t got particularly good insulation then it will use more energy on a day to day basis to keep warm. Despite this, the general advice is to keep your hot tub running all the time as several issues and problems can occur when the hot tub is sitting idle.

How often should I change the water in my hot tub if I leave it on all the time?

If the hot tub is in continuous use, then the water should be changed every 2 – 3 months. Change more frequently if the hot tub is heavily used or the water starts to cloud or smell.

Where should I install my Hot Tub outside?

Placing your hot tub outdoors means you can stargaze or enjoy the weather with your loved ones. Plus, you’ll have plenty of flexibility in design. Here are some tips as you’re deciding where to put your outdoor hot tub:

Consider your climate. In the cold winters, you’ll probably want quick access to the indoors. During hot summers, you’ll want to be in a shady area, so you may want to place your spa under a gazebo or umbrella.

Think about how you intend to use your spa. If you’re using it for recreation and socializing, leave plenty of room for activities and garden furniture. If you’d like more a secluded feeling, choose a private corner of the yard and add plants or a screen.

Of course, you’ll want to think about your view. Position your spa based on the view you most want to enjoy while you’re soaking. After all, your hot tub should really be all about you.


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