unvented cylinder

[damaan]

does anybody know if the unvented cylinder can go in a loft or garage? Any problems with doing so?
Also, will my 14 years old boiler work with unvented cylinder or would I need to change the lot?
Thanks

 

[PlumbBobBob]

you can get horizontal cylinders for going in the loft, obviously need to check weights etc. garage positioning is not a problem either. boiler probably need changing soon anyway considering it's age.

 

[lame plumber]

new boiler sensible and stick the lot in your garage, your service technician will thankyou in years to come, and if anything goes wrong you wont need new ceilings....

 

[Best]

Unvented cylinders require servicing once a year for to keep them working properly and for safety plus usually a 25 year warranty, so in a garage can be a very suitable place. Very good if boiler is near to the unit, - and also handy for both to be serviced together. If something leaked at the unit, then garage far better.
A couple points to consider is the distance from the unit to bathrooms, or perhaps a secondary hot water return will be needed.

 

[joni os]

Unvented cylinders can go in either position, provided pipework protected against freezing. Runs of pipework, including pressure relief dump, and maximising cold water feed also to be considered.

 

[lame plumber]

Unvented cylinders can go in either position, provided pipework protected against freezing. Runs of pipework, including pressure relief dump, and maximising cold water feed also to be considered.

and loft ladder, platform and lighting if you really think a loft is a sensible option.

 

[joni os]

and loft ladder, platform and lighting if you really think a loft is a sensible option.

Would those who put boilers in lofts also remember this.

 

[Best]

Cylinders leaking in lofts and causing damage below is obviously possible, but an extra problem unvented cylinders have is when their expansion vessel diaphragm bursts unknown to everyone, then the light steel vessel will rot with the mains water and eventually burst with high pressure, usually 3 bar supply taking all the ceilings below down

 

[heliotrope]

If cylinder is to go in loft then ancient boiler would likely need to be pressurised (It may be already)

Not all boilers can be pressurised.

 

[Best]

One other problem I forgot to mention about unvented units fitted at a high level (whether on an upper floor or in an attic) is this can be risky if mains water is turned off the unit for any reason and a tap at a lower level is opened. The suction can collapse the sealed cylinder.
Anti vacuum valve will prevent that happening, but who bothers or knows to fit them?

 

[cdodds2004]

imo its a lot of weight to put in a loft, only ever fitted one in a loft and located it over a supporting wall