Isolating second MegaFlo indirect cylinder

[MGB_Roadster]

I live in a 3 bedroom house with two bathrooms. It has two Heatrae Sadia Megaflo CL145 cylinders.

There are only two of us living here, and we only ever use one bathroom at a time, so I think the system may be over-specced for us, and we're paying to heat more hot water than we need. I'd like to isolate one of the cylinders to see if just using one is enough for us.

Does this sound like a reasonable idea, or is there a reason I need two ?

If I turn off the valves on the primary return and hot water outlet, then turn the thermostat down to "1" will that do the trick ? Is there anything else I need to do ?

I'm guessing it would make sense to swap the duty cylinder over every couple of months.

Any thoughts or help welcome.


Chris

 

[justlead1]

It difficult to be precise with out a knowledge of the set up. But if cylinder stats on both and hot take of are capable of being isolated it should not cause concern.

 

[Blackcatgas]

pics? get one properly disconected and drained, otherwise youl have stale water in one.

 

[MGB_Roadster]

Thanks for that chaps.

I was thinking that swapping the duty cylinder over every couple of months would prevent any water problems, but you can't be too careful about these things. (I don't suppose Mrs Roadster would be too happy if she came down with legionella 🙁 )

Not too easy to take a photo of the setup, but I've tried to attach one. There are valves on the outlets of both cylinders, but not on the inlets. In order to drain and fully isolate the nearest cylinder I would have to install an additional valve above the inlet and the drain valve (where I've wrapped a couple of bits of red tape in the pic).

First step is probably just to turn one of them off at the existing outlet valve for a couple of weeks to make sure we get enough hot water with just the one.


Thanks again for the help,

Chris

 

[justlead1]

Hi. A regular little plant room you have there. The only issue i can see is the draining down (not when you drain down to do the work / valves as opening a hot tap will allow air in the break vacuum. ) But when an individal cylinder is to be drained you will have to crack the compession nut on take off to allow air in. Also the drain of cocks are more for compliance than use, i would change for a better patten, as you may well have a lot of water flying about in the loft.