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Replacing open vent hot water cylinder
Hello,
Would it be possible to replace an open vent hot water cylinder with a non vented one? Would the new one fix water pressure too, as hot water pressure is basically non existent?
Thanks
Expert Trade Answers
Best Answer
"Yes it is possible depending on what’s the flow rate and bar pressure on the mains water , an unvented cylinder will increase pressure on hot water significantly more than a vented one"
Answered on 22nd May 2025 - Member since Apr 2020 -
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"Hi,
Yes replacing your existing system with unvented cylinder should cure your water pressure problems. You just need to make sure there is a route available for the safety discharge pipe 👍
Kind regards"
Yes replacing your existing system with unvented cylinder should cure your water pressure problems. You just need to make sure there is a route available for the safety discharge pipe 👍
Kind regards"
Answered on 22nd May 2025 - Member since Jul 2022 -
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"Yes a unvent hot water cylinder will solve the issue as it is not gravity feed pressure, it is mains water pressure and will go through a pressure reducing valve at 3bar. This is a expensive options. And cheaper option is to install a water pump."
Answered on 22nd May 2025 - Member since Mar 2025 -
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"Hiya yes you would need a unvented cylinder and the hot water pressure would be a lot better."
Answered on 27th May 2025 - Member since Nov 2024 -
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"Yes, it is possible to replace an open vent (gravity-fed) hot water cylinder with an unvented (pressurised) hot water cylinder, but it’s not a simple swap — it involves significant system upgrades and safety considerations."
Answered on 27th May 2025 - Member since May 2024 -
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"Hi you would need someone to have a very good look at the job first before any answer could be made as you might get away with putting a pump on the hot water to boast the pressure"
Answered on 29th May 2025 - Member since Oct 2024 -
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"Have good quality water pump fitted, as an unvented cylinder will cost £1500 and raise your storage tank to the attic if possible"
Answered on 22nd May 2025 - Member since Apr 2019 -
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"Yes, you can replace an open vent (gravity-fed) hot water cylinder with an unvented (pressurised) one. This often improves hot water pressure significantly, as unvented systems are fed directly from the mains.
Benefits:
Stronger, more consistent hot water pressure
No need for a cold water tank in the loft
Modern, space-saving design
Important considerations:
Your mains water pressure and flow rate must be suitable (ideally 2–3 bar and 20+ litres per minute)
Pipework upgrades may be needed
Installation must be carried out by a G3-qualified engineer
Next step:
We recommend a site visit to check your water pressure and pipework. Contact us to arrange an assessment and quote."
Benefits:
Stronger, more consistent hot water pressure
No need for a cold water tank in the loft
Modern, space-saving design
Important considerations:
Your mains water pressure and flow rate must be suitable (ideally 2–3 bar and 20+ litres per minute)
Pipework upgrades may be needed
Installation must be carried out by a G3-qualified engineer
Next step:
We recommend a site visit to check your water pressure and pipework. Contact us to arrange an assessment and quote."
Answered on 23rd May 2025 - Member since May 2025 -
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