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Replacing hot water copper tank


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Surecal seem to be well regarded. 

 

You can probably repair the pinhole with a patch, but if there is one pinhole now, there will be another one along son after you patch the first one because whatever ate the metal will ne doing that all over the tank.

 

N

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We had a leak where the cylinder was (badly) supported. We (or rather himself) soldered a copper patch on, reinsulated it and it is now back in place with better load spreading supports. So far so good, cue engine bay filling with cauliflower water!

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12 minutes ago, MrsM said:

We had a leak where the cylinder was (badly) supported. We (or rather himself) soldered a copper patch on, reinsulated it and it is now back in place with better load spreading supports. So far so good, cue engine bay filling with cauliflower water!

At least cauliflower water doesn't smell as bad as cabbage water. 😀

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23 hours ago, BEngo said:

Surecal seem to be well regarded. 

 

You can probably repair the pinhole with a patch, but if there is one pinhole now, there will be another one along son after you patch the first one because whatever ate the metal will ne doing that all over the tank.

 

N

 

Surecal are widely available and well regarded, also expensive (distributor markup) and only come in standard configurations, which is not helpful if where all the connections are doesn't allow an easy direct replacement for your existing one.

 

Two companies who are also well regarded, cheaper (direct from manufacturer), and IIRC will make a cylinder to your exact requirements if a standard one doesn't suit:

 

https://www.coppercylinder.co.uk/marine-calorifiers-boat-cylinders.html

 

https://shop.newarkcylinders.co.uk/marine-calorifiers

 

 

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27 minutes ago, IanD said:

 

Surecal are widely available and well regarded, also expensive (distributor markup) and only come in standard configurations, which is not helpful if where all the connections are doesn't allow an easy direct replacement for your existing one.

 

Two companies who are also well regarded, cheaper (direct from manufacturer), and IIRC will make a cylinder to your exact requirements if a standard one doesn't suit:

 

https://www.coppercylinder.co.uk/marine-calorifiers-boat-cylinders.html

 

https://shop.newarkcylinders.co.uk/marine-calorifiers

 

 

Have used Newark copper cylinders to produce bespoke tanks for our last 2 houses. They have been a great company to deal with.

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45 minutes ago, MrsM said:

Have used Newark copper cylinders to produce bespoke tanks for our last 2 houses. They have been a great company to deal with.

I got a replacement domestic cylinder from them a while ago. Agree they are easy to deal with, and the total cost was less than an off the shelf cylinder from B&Q which would have required much pipework alteration to fit.

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15 hours ago, David Mack said:

Is this copper tank a marine calorifier or a domestic hot water cylinder?

 

Aren't most copper cylinders are just modified domestic units? I thought the proper marine ones are much more expensive and made from stainless steel.

 

Is there a reason that the copper ones leak so frequently in boats - higher temperatures from the engine causing greater stress, or do they leak when installed in houses too? 

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5 minutes ago, blackrose said:

 

Aren't most copper cylinders are just modified domestic units? I thought the proper marine ones are much more expensive and made from stainless steel.

 

Is there a reason that the copper ones leak so frequently in boats - higher temperatures from the engine causing greater stress, or do they leak when installed in houses too? 

You can get marine ones made from either copper (cheaper, easier to work with) or stainless steel (more expensive, harder to work with). Unlike domestic ones they're designed to be pump pressurised and are tested to quite high pressure (5 bar?), so are made from thicker material than domestic ones, which is why they cost more.

 

If the boat system is badly designed (no accumulator, lots of cycles from high to low pressure -- or even worse, a cylinder not designed to take the pressure) then they can still fail from fatigue, regardless of material.

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Traditional domestic copper cylinders are designed for the low pressure head from a cold water tank in the loft. Marine calorifiers are designed for pressurised boat water systems. You can get higher grade domestic cylinders, but at a cost premium. Domestic hot water tanks designed to run at mains pressure are much more substantial (and expensive) and I think many are stainless steel.

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