When looking at the hot tub that you are considering purchasing please ensure that you have the best information to hand to help you make an informed decision. Here are some guidelines for you to consider.
Hot Tub Structure
Be careful to check this out as the more bracing and sturdier the frame and sub structure are the less likely it is that you will develop cracks or broken pipe joints. Spas are not all made the same and the premier brands pay a lot of attention to this. Ensure that the frame and sub frame are engineered to take the weight of the water and bathers this can sometimes exceed 2 tons.
The shell and main structure are the most important things to get right on a hot tub as components can be sourced and changed if a fault develops. If a spa structure fails due to poor design /construction then the spa is written off and if you have no insurance cover then this can be a huge cost.
I have seen many low quality brands which suffer from this and on my spa repair side I have seen spas lasting only 3 years so do take care on this very fundamental point.
The premium brands such as Vita, Coast, Sundance etc have very well engineered spa structures.
Make sure that there is sufficient protection from rodents entering the structure.
By pushing on the side panels you can get a good feel to a hot tubs sturdiness.
Insulation
This the most hotly contested area and one of some confusion to the buyer. If you consider that all premier hot tub brands will offer top quality insulation.
On today’s hot tub the main choice falls between foam filling, slab insulation such as Blue Max or foil backed type products. Take care that your hot tub has good quality insulation many cheap imports do not have adequate systems and will cost considerably more to run over time. Don’t get into a tiz over one dealer saying foam is best and another saying foil is best. Just make sure that they do have insulation systems on board. You can always ask a customer to verify.
Incidently Vita's Blue Max insulation is also rodent proof as its treated with Borax.
Acrylics – Hot Tub Shell and Cabinet Sides
Typically made from either Aristech or Lucite these are the most prestigious manufactures. Beware of imitations and be sure to confirm that your hot tub is made of one of these makes.
Inferior brands are known to de-laminate and to crack with use. The Acrylic needs to be bonded to a sub structure material so make sure that this is adequate. Incidently Coast use steel bar section bonded to the shells key stress points.
The colours are varied and it’s probably best to opt for a safe neutral colour to help avoid dating of your hot tub.
Also take into consideration the lighting. Most hot tubs have LED colour changing lights so a nice light colour shell will help bring out the lighting to the best effect. Dark colour shells will absorb the light and therefore your lighting will not look so impressive particularly at night.
Cabinet Sides
Most manufacturers have turned to synthetic types of cabinet although many manufacturers still offer wood. It’s a personal choice as the look and feel of wood cannot be bettered but of course you need to remember to re stain every few years to keep it in good shape. The synthetic cabinets just require a wipe over with a cloth but of course can suffer from UV fading over time.
Hot Tub Control Systems

Again another key area as you will need to make sure that your hot tub provider can get parts in years to come. Makes such as Vita and Coast have excellent product support. Many companies use what’s in the market off the shelf type systems. We always recommend checking that your hot tub control system should be one of the major manufacturers such as Balboa. The majority of hot tubs that we sell are Balboa so future proofing is not a problem. Look for Balboa M7 technology this is currently best in class.

Hot tub heaters are another area to consider. For the UK market its best to have no less than 2 kW and ideally 3kW is best to ensure constant heat is available from your hot tub even on the coldest winters day. The Balboa systems are either Teflon coated or Titanium coated these give a longer life to the heater. The heaters are serviced by either a desiginated circulation pump or by one of the main hydrotherapy pumps. Circ pumps are generally fitted to higher end price spas as they offer very effecient filtering and heating management . Circ pumps are also very quiet in operation VS a main hydro therapy pump so if noise is an issue then a circ pump option is a must.
Ozone or Not Ozone
Ozone gas is produced by a special system that injects the gas into the spas water just after the heating stage. This process helps to kill bacteria and clarify the water resulting in less chemical usage. If your hot tub has this system on board then it is a good thing. Some offer this as an upgrade.
As with all things the ozone generators do wear out over time so you have to budget a replacement at some time during the hot tubs life. Typical replacement costs are around £350.
Hot Tub Jets
Try to avoid the issue of comparing quantity of jets try to be more scientific and look for quality of jets, where they are positioned and what sort of massage do they give. Cheap imports rely on using high numbers of poor quality jets to make their ads look impressive. Of course not all the jets are the same top brands such as Sundance, Vita & Coast spend huge amounts of money on R&D to ensure best jetting technologies.
Filtration
The majority of hot tub manufactures use pleated drum filters to take care of water cleaning. Industry standard is 50 sq ft (This means if you took off all the material from the filter and laid it out it would measure 50 sq ft in area)
The key thing is the larger the filter area the better the cleaning so look for 100 sq ft or more to be in the higher end of filtration. Coast spas incidentally have 100ft and 175ft Cyclonic options which clean to an extremely high level.
Filter size is an important aspect and with increased size comes increased price of your hot tub.
As a guideline 50 sq ft is prevalent in spas up to £6k 100 sq ft can be seen from £6k ~ £8k and above £8k you will start to see larger sizes up to 175sq ft like on the Coast spas.
Lighting
The majority of hot tubs today are fitted with LED lighting that offers colour-changing options. These systems are generally very reliable and should a bulb fail they are easy to source and fit.