Lower hot water flow / pressure

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   A correction on my part. If the output of the water heater is normal, then the problem likely IS the hot water lines (I misstated the opposite). However, I will say that if you simply observe that output of an open hose, it may be difficult to determine if it is normal without comparing it to something (like the cold water supply for instance). I think if you connected it to a fixture it would be easy to compare hot pressure vs cold pressure.

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Arcadia Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 27 November 2017 Location: Sag Harbor, USA Status: Online Points: 1112	Post Options Post Reply Quote Arcadia Report Post Thanks(0) Quote Reply Posted: 08 July 2025 at 21:26
	A correction on my part. If the output of the water heater is normal, then the problem likely IS the hot water lines (I misstated the opposite). However, I will say that if you simply observe that output of an open hose, it may be difficult to determine if it is normal without comparing it to something (like the cold water supply for instance). I think if you connected it to a fixture it would be easy to compare hot pressure vs cold pressure.
	Leon / ARCADIA 2018 Hanse 588 Sag Harbor, NY

Mark Pullen Members Profile Send Private Message Find Members Posts Add to Buddy List Commander Joined: 20 July 2022 Location: London, UK Status: Offline Points: 90	Post Options Post Reply Quote Mark Pullen Report Post Thanks(0) Quote Reply Posted: 11 July 2025 at 22:15
	Understood. Many thanks, Mark
	Mark

NORStian Members Profile Send Private Message Find Members Posts Add to Buddy List Sub Lieutenant Joined: 14 August 2025 Location: Bergen Status: Offline Points: 1	Post Options Post Reply Quote NORStian Report Post Thanks(0) Quote Reply Posted: 14 August 2025 at 21:28
	Hi Mark. Were u able to fix the problem by disassemble hot water line from you’re heater? Did you find any inclusion inside the pipe/tube? I hav the same issue on my Hanse 415 2013mod. Regards Stian Edited by NORStian - 14 August 2025 at 21:29

Mark Pullen Members Profile Send Private Message Find Members Posts Add to Buddy List Commander Joined: 20 July 2022 Location: London, UK Status: Offline Points: 90	Post Options Post Reply Quote Mark Pullen Report Post Thanks(0) Quote Reply Posted: 15 August 2025 at 15:33
	Hi Stian, I've not visited the boat yet. I'm next out during late September. I'll update this post when I do and hopefully have time to investigate.
	Mark

Mark Pullen Members Profile Send Private Message Find Members Posts Add to Buddy List Commander Joined: 20 July 2022 Location: London, UK Status: Offline Points: 90	Post Options Post Reply Quote Mark Pullen Report Post Thanks(0) Quote Reply Posted: 18 October 2025 at 09:48
	Update - success... On my recent visit I took the following steps to improve the flow on the hot water side: The water tank was hot, after motoring. Checked the bathing platform tap was on hot. Drained the water tank from the cold taps to retain the heat in the calorifier. Added 12 litres of cheap supermarket vinegar directly to the tank. Ran each hot tap individually, until I could smell vinegar. Left for about three hours. I figured this was long enough was the tank was hot. Part filled the tank and flushed the system a few times. The flow on the hot side has now much improved - almost as good as the cold water side. I'm having the tank replaced with a flexible bladder over the winter. At this point, I'll introduce a T junction after the tank and before the pump, so that I can bypass the new tank when adding vinegar. I'll add this routine into my annual (maybe once every two years) maintenance regime. It was easy to do, inexpensive (£15 in vinegar) and the vinegar smell was barely noticeable after I flushed the system. Thanks for all of the above advice.
	Mark



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