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Frequently Asked Questions

  • How do I find out the size of my radiator tapping?

    Firstly, look at your radiator (the area you would normally bleed) this is called a bleed plug. The plug screwed in to the tapping will either be a chrome hexagonal valve or a plug with a square cavity in it. Radiators have either a 1/2",1/8" or 1/4" BSP thread. If you are uncertain contact your radiator’s manufacturer.
  • What does BSP mean?

    BSP means British Standard Pipe.
  • I think I have a 1/2" BSP thread, how can I be sure?

    With a 1/2" BSP thread, the threaded hole in the tapping at the top of the radiator is approximately 20mm diameter – you should be able to fit your index finger in the tapping.
  • Can leak-stop products be used with the valves?

    We would not recommend their use as they can sometimes jam the valves.
  • Can corrosion inhibitors be used with an Aladdin automatic valve?

    Yes, although fitting the valve should reduce the need for corrosion inhibitors as all of your radiators will be free of air. To allow inhibitors to be used, ensure at least one radiator has a manual vent plug fitted at the opposite end to an autovent. This will allow the inhibitor to be injected.
  • Do the valves work on both Closed and Open systems?

    Yes, on newly installed closed systems, you may experience a slight pressure drops over the first couple of weeks. This happens as the dissolved air separates from the fresh water. Any further pressure drop would be caused from loss of system water i.e. leaks. Some installers prime such a system 10% more than its operating pressure to compensate for this initial pressure drop.
  • On a Closed system will fitting automatic vents cause the pressure to drop to zero and the boiler stop operating?

    The answer is linked to the above – continual venting will be due to new air entering the system (through micro-gaps in joints, etc). Once the fresh water has vented its 17% of absorbed air the volume of water cannot further reduce in size – so if you still experience pressure drop it’s due to water loss i.e. a leak, which will require curing.
  • Can I fit the valve to a piping 'spur' at a system high – point?

    Yes, provided the temperature of the piping allows the valve to operate at 35°C for the Hygroseal vent.
  • Do they work on negative pressure systems?

    Yes, we would recommend the HV30C or Micro as they have a semi-one way valve fitted already as standard and will work on negative pressure systems.
  • Can I fit them to a new system?

    Definitely, in fact you will save significant installation time. There is no requirement to visit each radiator as the valves close automatically once the radiator is full of water, the usual visit shortly after installation to bleed the radiators will no longer be required.
  • Air collecting in a radiator can be an early indication of a leak in the central heating system. Should I be worried that fitting an Autovent will mean that I spot a leak later?

    On a pressurised system:
    Air can enter the system through micro-gaps in joints etc without a leak, but in some cases a leak could lead to air collecting in one radiator and in those cases fitting an Autovent might delay the identification of a leak. On such systems, we recommends that Autovents should be fitted to installed radiators that have a history of collecting air and only after a careful inspection of the system has not identified any leak.


    On a header-tank system:
    After the air absorbed in the water has separated, the best early indicator of a leak is a drop in pressure of the system and an Autovent should, if anything, lead to a faster drop in pressure so an even earlier indication of a leak.
  • What is the difference between a HV30 and a HV30C valve?

    The HV30 is a cartridge-free version of the HV30C valve. The HV30 works in exactly the same way and has identical operating characteristics as the HV30C with the only difference being that the operating mechanism for the valve is directly assembled into the housing, not in a cartridge. The Cartridge on a HV30C valve can be replaced meaning the valve has a longer lifetime.
  • What is the difference between a Hygroscopic™ Autovent and a de-aeration valve?

    None, they are the same valve but a different name given.
  • Can I vent the Hygroscopic™ Autovent manually?

    Yes. Cartridge version (HV30C): by loosening the cartridge slowly until you can hear gas/air escaping. Yes. Cartridge-free version (HV30 or Micro): by using a spanner to loosen the whole valve slowly until you can hear gas/air escaping.
  • How do I know when to replace the HV30C cartridge?

    If after 3 - 5 years the radiator starts becoming cold it may mean the cartridge needs replacing. However it is worth venting manually first.
  • My HV30/HV30C/Micro is not venting?

    The first time radiators are fitted with this type of valve, the air hisses out until water hits the hygroscopic washers inside. At this point they will seal and you will often see a small bubble of water. If more gas/air builds up in the radiator it will not escape until these washers are dry, so please give your valves a little time to dry out completely before contacting us.
  • Don’t all automatic de-aeration valves leak?

    No. Aladdin Autovents do not leak. They are guaranteed to operate for 3 years and guaranteed leak-free for life. They contain a patented mechanical valve that positively closes when water gets to the internal mechanism of the valve. The Hygroseal™ range has a 5 year replacement guarantee.
  • Do you sell genuine Aladdin Products?

    All of our products are genuine NLB Aladdin valves, each valve holds the unique Trademark.
  • Do your products have an EAN Number?

    They do, all products come with a 13 digit EAN number from the manufacturer.
  • What are your Opening Hours?

    We are available via telephone between 8am and 5pm Monday - Friday. We would recommend you email us however, and we will answer your query within 24 hours, 7 days a week.

    Tel:01279 647003
  • I’m not fond of buying on the internet can I buy over the telephone?

    Unfortunately, we are a small family run business and we do not offer telephone orders. We are available via telephone between 8am and 5pm Monday - Friday. We would recommend you email us however, and we will answer your query within 24 hours, 7 days a week.

    Tel:01279 647003
  • What if I order the wrong valve?

    Not a problem, if you keep your valve in its originally packaging and return it to us, we can send out a replacement. We would recommend you email us at hello@tumarketing.co.uk   or   call us on: 01279 647003
  • Can I have the valves sent to a different address?

    Not a problem, feel free to add a message in the messages section when you place your order and don’t forget to add this in the payments section too. Email us at hello@tumarketing.co.uk   or   call us on:01279 647003 if you are wanting to double check.
  • How are the valves sent?

    We send all valves 1st class Royal Mail.
  • I have a faulty product, who should I contact?

    You can email  hello@tumarketing.co.uk   or call us on: 01279 647003

Heating Facts

Fresh water entering a heating system contains about 15% air by volume which is just one cause of air in your radiators

Heating and hot water accounts for over 80% of the energy consumption in the average home.

Controls to reduce the average temperature in the house by 1°C, will reduce consumption by up to 10%.

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