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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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Workaround to pressurise a Combi despite low water pressure
Is there a workaround that would enable me to pressurise my Combi to 1bar when the mains water pressure is only 0.75bar ?
The combi is working and when heating the pressure rises to 0.9bar. I am concerned that the combi should be operating at the recommended pressure. Some have suggested attaching a 1.5bar shower pump ( with attached water tank). Is there an alternative e.g. water pump that would serve to bring the combi up to 1bar purely for commissioning purposes. There is adequate DHW water flow. |
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Is there a workaround that would enable me to pressurise my Combi to
1bar when the mains water pressure is only 0.75bar ? Get the water company to increase the pressure. 0.75 bar should be below their minimum permitted value. In any case, nothing untoward is likely to come from running 0.75 bar, unless the boiler is at the bottom of a very tall house. I wouldn't muck around with pumps for a measely 0.25 bar that will have no discernable effect on the operation of the boiler (unless it has a very sensitive low pressure cutout). Christian. |
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Ronald Fraser wrote:
Is there a workaround that would enable me to pressurise my Combi to 1bar when the mains water pressure is only 0.75bar ? The combi is working and when heating the pressure rises to 0.9bar. I am concerned that the combi should be operating at the recommended pressure. Some have suggested attaching a 1.5bar shower pump ( with attached water tank). Is there an alternative e.g. water pump that would serve to bring the combi up to 1bar purely for commissioning purposes. There is adequate DHW water flow. Garden spray pump adapted to connect to the filling point. You can use this to introduce inhibitor etc to the system too. But as Christian says 0.75 is close enough for jazz anyway. |
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[quote=Ronald Fraser]The workaround QUOTE]
Gentlemen, Thank you for providing such prompt, elegant and comprehensive solutions and advice. Whereas I shall keep an eye on the thread over the coming period, I am now confident - based on your recommendateions - of a way forward. My sincere thanks to you all. Ronald |
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kafkaian wrote: Paul Barker Wrote: There is no requirement for any water company to provide any amount of pressure. All they are required to provide is water to your tap. I would agree with this. I wouldn't. Water suppliers must provide an average of a 7 metre static head (~0.7 bar?) at the customer premises in accordance with the 'Water Supply and Sewerage Services (Customer Service Standards) (Amendment) Regulations 1996' (available at http://www.legislation.hmso.gov.uk/s...63065_en_1.htm). Furthermore, many suppliers aim to raise their minimum to greater than this, and also to provide a minimum average flow rate (10m and 9lpm respectively for Sutton and East Surrey Water). Mathew |
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