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Author Topic: Use an unvented cylinder in a vented system?  (Read 1493 times)
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« on: December 08, 2014, 11:25:58 PM »

I have a DIY vented 2nd hot water system which I feed with rainwater and use for one of our showers. It has been working well for 3 years.

The cylinder is only 90l or so, and I'm looking for a 2nd hand bigger one.

Is there any reason I can't keep system as vented, but use an unvented cylinder? There seems to be a better choice of unvented cylinders on ebay.

10kW PV. Rainwater collection-14 IBCs. Custom Arduino based Immersun type PV diversion. HomeSeer home automation, Househeat/Conrad TRV radiator actuators + FHEM. SageTV
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« Reply #1 on: December 09, 2014, 07:28:29 AM »

Unvented need to withstand far more pressure than unvented cylinders.  So I would think unvented in place of vented is OK.  The opposite is not the case.

I know of one fellow who finished up with a collapsed cylinder because he blocked the vent pipe, turned off the roof tank supply and emptied the system!
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Posts: 436

« Reply #2 on: December 09, 2014, 10:52:44 AM »

Beware of corrosion with stainless cylinder and rain water. I know well water causes issues so it may be the same with rain water. Worth checking first.
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