Yes, you can download the SUPA Heater product manual here: Download

OPSO activation and reset: From September 24 onwards we have included a grey coloured regulator in the set with a built-in OPSO (over-pressure, shut-off valve) safety feature which stops the gas feeding to your heater in case there has been unexpected rise in gas pressure. Your heater will initially start because there is gas remaining in the supply hose, but this will be used in just a few seconds and the E1 signal will be seen on screen.

Typically, you will find this occurring with a new gas bottle as it may have been filled and done at a slight over-pressure, so the first time used it causes the E1 (low gas / no gas) signal on the heater to be raised.

To reset the OPSO valve, follow the following process:

1. Turn the gas off at the tank.
2. Turn the brass screw on the side of the grey regulator to 3 o’clock and let it return to 12 o’clock, as you know.
3. Detach the long section of gas hose from the short section and put a thin screwdriver down the connector on the long hose connected to the regulator to open it and release all gas from within this hose – this will reduce pressure to zero. The shorter hose is always open with no seal, so you don’t need to do anything with this.
4. Reattach the hoses.
5. Start the pump or switch on the water if delivering cold water from the tap.
6. Reset the heater to whichever operational mode you wish to use, now slowly open the valve on the propane bottle until completely open.
7. The heater should now ignite and continue heating.

Please try this a few times to get it working. If you find you still cannot get the heater to ignite and stay on, please let us know by emailing support@supa-heater.com and we will be in touch to resolve.

Low gas: When you are running very low on gas, there may be insufficient to power SUPA – it can start, but after a few seconds the gas symbol goes out and the E1 symbol is seen. You can check how much gas you have left in the bottle by using this simple but effective trick: boil a kettle and pour hot water down the outside of the gas bottle. After a few seconds, run your finger down the face of the bottle where you have poured the hot water. When your finger feels a change in temperature from warm to cold, that is the level of gas remaining in the tank.

Wrong bottle size: SUPA is so powerful it needs a minimum propane bottle size of 19 kg to work 100% effectively, anything lower that this and the feed per hour may be insufficient for it to operate optimally. You may substitute for a 13 kg bottle, but please note that due to the inability of this size to feed enough gas, you will see a loss in efficiency of approximately 8%. Whichever bottle is chosen, it must only be used with SUPA’s screw-in OPSO regulator.

Please also remember that the larger the bottle the cheaper the gas per kWh.

Old regulator: Old regulators can under-perform, and your SUPA is the equivalent of a top performing athlete – changing the regulator for a new one will improve performance and resolve the E1 issue if this is the cause.

Length of gas hose: Your gas hose should be a maximum length of 3.2 m in total, beyond this the gas pressure supplied to the heater may drop sufficiently to cause the E1 code to appear.

Poorly constructed quick-coupling: Rare, but not impossible. Check that the male fitting of the coupling is fully unobstructed by looking though it – there should be a clear circular hole right the way through. We have occasionally seen issues where this is not correctly drilled by the manufacturer causing the flow of gas to be significantly reduced. Under these conditions, change the coupling.

E1 Error Code Video

Over-Heating: If the flow rate though the heater is too low, then there is insufficient water to capture the energy produced by SUPA heater and the temperatures sensors advise you of this be displaying the E3 symbol. You will see the temperature rise rapidly on screen and when it hits 70°C, the system will stop.

The reason for this will be that over time the filter on the front of your pump is clogged up – simply unscrew the clear container containing the filter, remove the filter and rinse it out thoroughly before reinstalling and trying again. Alternatively, the hoses or the pump itself, may have an obstruction within them, so flush the entire system by fixing the hose pipe to the front of the pump and switching the tap on full for 1 minute – there is no need for the pump or heater to be on during this process.

Water Flow Sensor Failure: Before the heater is allowed to ignite two things need to happen, 1. The system must recognise water is flowing and 2. The exhaust fan must switch on. You see these two symbols when the system is heating along with the flame symbol.

If the water flow symbol is not flashing on screen it is because the sensor is not registering flow. The sensor is positioned inside the body of the heater and joined to the intake just above where the cold water enters. It is highly likely that human hair has found its way past any filters and wrapped itself around the water flow sensor impeller. When lots of hair does this it acts like rope, stops the impeller from rotating and needs to be removed. It is only when the impeller is allowed to rotate freely that a signal is registered by SUPA heaters internal systems which says water is flowing well, you can now start the exhaust fan, open the gas valve and ignite the burner.

If this occurs please contact support@supa-heater.com and we can send you a video on how to remove and examine the flow sensor, and if hair is present you can attempt to remove it. Otherwise, and time available, we can arrange to send you a new flow sensor at a cost of £19.95 + £4.95 postage as a replacement.

If you are experiencing this issue, we suggest you purchase an end of line filter and fix this within the end of the blue hose that you place in your tub. These will be available from our store from 1st June ’25 onwards.

If you have a noisy pump and/or you are getting an A1 error code on screen, it means that the water flow rate is too low – this could be due to a blockage in the pump strainer/filter, clogging of the fine water inlet filter within the water inlet on the heater itself or a blockage in the hoses.

Let’s take you through the process to resolve this step by step:

Step 1: Unscrew the clear housing of the strainer located before the inlet to the water pump, remove the stainless-steel filter, wash it so it is clean of debris, refit the filter and replace it on the pump.

Step 2: Remove the blue inlet hose from the brass ‘water in’ connection on the heater. Inside there is a very fine filter mesh connected to a white washer running around its edge. Using a pair of pliers or a knife prise this out (it is only pushed in) and examine it. If it is clogged by debris and hair etc., remove it altogether, clean it thoroughly with warm water, reinsert and then refit your blue water inlet hose.

You can choose whether to refit this fine filter following cleaning or leave it out for a short period whilst considering other options. The clogging of this fine filter is telling you there is more debris in your water than normal, and you should potentially change the water more regularly to reduce the level of Total Dissolved Solids (TDS) or clean/replace your filters more regularly.

There is no need to stop using your SUPA heater with this filter removed but if you are finding a lot of hair at this position for whatever reason we recommend it is fitted at all times.
End of hose pre-filters are available from Amazon which will significantly help to reduce this issue without having to remove the blue inlet pipe and clean the fine filter if the clogging is more frequent than you want to experience.

Step 3: If you still have a flow rate that is less than 10 litres/minute, connect your garden hose to the pump inlet and turn on the mains water supply so clean water is flooding through the system. Keep the long red (hot) hose in place on the outlet and after 20 seconds or so change this over to the long blue cold hose to run water through that as well. This should now have fully cleaned the system and flow rates should be back to normal.

A1 Error Code Video

During colder times of the year, after you have used SUPA, it is very important to remember to remove the water from inside the heater. You can do this by leaving the cold and hot hoses out of the water and switching on the pump for 5-10 seconds until no water is coming out of the red hose.

After this, tilt SUPA sideways left and right when viewed from the front for a 10-15 seconds, so any remaining water flows out of the hoses.

Remember to use the cover to protect your SUPA from the elements and store in a warm dry place where it cannot freeze.

Note: The freezing of any water in the internal pipes could cause major damage to your SUPA which is not covered by your warranty so please take care during this process.

Unfortunately, no you can’t. Because SUPA is so powerful, it needs a minimum propane bottle size of 19 kg to work effectively, anything lower that this and there is insufficient volume of gas able to be drawn to fuel the burners and you are likely to see the E1 error code. Action: change to an 19kg or 47 kg bottle (the larger you use the better value per kWh). Find your local gas stockist here and here.

Need to top up your gas supply? We’ve got you covered! Click the links below to find trusted gas suppliers near you. Whether you’re looking for Flogas or Calor, it’s never been easier to keep your hot tubs heated!

Flogas Stockists

Calor Stockists

No, for best performance please do not use any other regulator than that supplied with your SUPA heater. The OPSO (Over-Pressure Shut-Off) regulator supplied offers a much higher level of protection than normal regulators and will protect the SUPA heater and you in case the gas pressure supplied to your SUPA heater exceeds expected values for any reason.

SUPA heater can be used with any hot tub or small pool as the hoses are simply placed over the top of the side wall.

OK, so this depends on the volume of water to be heated, its start temperature and the target temperature to be achieved. Typically, a 4-person hot tub is 800 litres and 6-person 1,000 litres. A 4-person hot tub heated from 20°C to 40°C takes about 40 mins and around 60 mins for a 6-person hot tub. That’s a massive improvement on the 12 to 15 hours to heat using their built-in electrical heaters.

If you want to calculate the exact time it will take to heat your hot tub, use the calculator page, here.

A major benefit of using a SUPA heater is that you only need to use it when you want to use your hot tub. This is because it’s so fast. By switching your hot tub off when it’s not needed, you will save £££s on heating bills, and you will also reduce the amount of chemicals you need to use to keep your water clean and safe – SUPA will quickly pay for itself.

Yes! and it’s really easy! By connecting your mains water using a garden hose with a ‘Hozelock’ type fitting into the front of the pump (there is no need to switch the pump on as the water pressure is more than sufficient on its own to push through the heater at the required flow rate), you simply set your SUPA to Mode 2 and set the temperature you want (be careful as you should not go above 40°C for hot tubs on safety grounds). Make sure your gas is turned on then open up the water supply tap and your SUPA will start and heat your water instantly to the desired temperature.

Note: When the water from the mains supply is exceptionally cold during deep winter months, even SUPA won’t have the full power to heat the water to high desired temperatures close to 40°C and above (for other purposes). Under these conditions you can turn the flow of water down slightly to achieve the temperature you need, or alternatively, fill your tub as quickly as possible and once full switch to Mode 1 and recirculate your hot water up to the desired temperature.

No! The heater won’t fire up, in fact if you are using the correct minimum sized gas bottle you shouldn’t be able to use this fitting at all. You must use a screw-in type gas regulator.

Yes! Propane produces 43% fewer greenhouse gases than electricity generated for the national grid. It emits no sulphur dioxide, methane or nitrogen oxides and is classed as a clean fuel in the Clean Air Act, 1990. Also, SUPA wastes very little fuel in the combustion process (92% efficient), so you use less energy. Importantly, the propane sector is developing “renewable propane”, working towards a zero-carbon emissions future.

Yes, it is and to the latest certification – it is UKCA approved. To avoid confusion all water heaters in Europe need CE approval, but from 1st January 2023, all water heaters sold in the UK need to be UKCA approved. CE approval does not mean it is automatically UKCA approved, as it did pre-Brexit. This certification means it has been tested for performance, quality, efficiency and emissions to ensure it is approved for use in the UK. Any heater that doesn’t have this is not approved, even if it is sold through what you believe to be a reputable supplier/retailer.

No! The SUPA pump is self-priming, simply put the hoses in the hot tub and switch on.

Yes, really easy, but please read the instruction to make sure you haven’t missed anything important!

NEVER sit in the hot tub when SUPA is operating, as the water going back into the hot tub could be as high as 65°C, which could badly scald skin if left in contact for too long. Please heat the water to 40°C (when the temperature of the water passing out of SUPA shows 65°C, it will automatically switch off and your tub will be at 40°C). Always allow the water to be circulated for 30 seconds or so to ensure the hottest water is evenly dispersed.

NEVER use SUPA indoors. SUPA may exhaust carbon monoxide. This is a poisonous, flammable gas that is colourless, odourless and tasteless. Breathing this gas can cause injury and even death. Always use SUPA outdoors in a well-ventilated space.

SUPA has been designed to be used with legs to ensure it is easy to move, and store away when not in use. However, it can also be hung on a wall. Simply remove the legs and mount the pump to a shelf (still using the anti-vibration feet). However, whilst SUPA is water resistant it is not waterproof so prolonged exposure to heavy direct jets of water could penetrate in the electrics and pump, so please ensure it is covered over when not in use and when it is being used offer some form of rain protection above. It can be exposed to light rain for short periods, but if you look after your SUPA, then SUPA will look after you! Additionally, never use SUPA in a closed and unventilated space.

Well really, it’s up to you. We recommend you shower before using your hot tub to keep the water clean and if you want to rinse off after getting out your hot tub to rinse away chlorine. It also comes in handy if you need to wash your dog, or if you fancy a spot of camping.

This should be your preferred temperature, but no hotter than 40°C for a human or 34°C for your dog. SUPA heater will control the temperature consistently at the ‘set-temperature’ but can naturally vary by 1 or 2°C as it attempts to balance the temperature of the water in use. Wait for the temperature to stabilise before use on yourself, child or dog.

You can simply plug SUPA into your normal electricity sockets using an extension lead or you can plug it into an outdoor wall socket. This must be weatherproof and have an RCD fitted. A Residual Current Device (RCD) is a lifesaver; it’s a fast-acting, safety trip switch that reduces the risk of a fatal electric shock. We do not recommend using standard electrical extension cables.

SUPA is fitted with an automatic cut-off switch for when it falls over. The burners will simply stop.

No it doesn’t but we have tried to simplify the colours to make assembly easy and practical, i.e. blue for cold and red for hot.

We DO NOT recommend that you use other hoses for hot tub heating, especially in Mode 1 where water temperatures can reach 65°C. If you want to use other hoses from the mains or for the power washer, then yes, of course. Just make sure that threads/connectors match perfectly, and the components used are suitable for the range of desired temperatures.

Be careful with garden hoses and hot water – most are not designed for high temperatures. So for example, if you are using warm water to wash your car, please make sure it is no hotter than 40°C.

This is not specifically required as we have designed the fittings to work without leakage. However, changes in ambient temperature can affect these fittings, so if any drips are seen when using your system then we suggest the use of PTFE tape to stop these. Please ensure that all threads are aligned properly when fitting hoses and connectors, anddo not over-tighten! We do not recommend the use of PTFE tape for the ‘gas in’ fitting and take care to ensure that the green fibre seal is on the top surface and not positioned under the gas pipe insert (an easy mistake to make and we have done it ourselves).

No, not waterproof, but it is water-resistant – so it can’t be exposed constantly without risk of water penetrating the cover into the electrics and motor but it can be exposed to light rain and showers for short periods.

We recommend that it be used in dry conditions and stored away when not in use. If it does start to rain or you expect rain to occur for short periods, then time when you want to use the heater to avoid this period or alternatively provide a degree of shelter for the heater, e.g. by using a parasol. We also supply a cover that uses the latest development in coatings to ensure no water enters the system when not in use.

SUPA is an advanced piece of mechanical, electrical and electronic equipment, if you look after it well, then your SUPA will look after you.

We include an additional stainless steel micro filter before water enters the pump to ensure that any small debris does not enter the pump and/or SUPA heater and potentially cause harm or damage. It should, therefore, always be used in addition to your paper based in hot tub filter.