Direct Cylinder Query

[Peter W]

Hi,

I'm installing a direct 42x18 cylinder for a friend with a 3kW 27" immersion heater mounted in the top of the cyl.

Will this be enough to heat the majority of the cylinder or will i end up with stratification and not enough hot? Just two elederly people live in the house.

Also, the feed is 28mm and the DHW draw off is 22mm, so do i just need the right size of cylinder union for each, then make them in with Boss / hemp, then make up the pipework connections?

Any help would be greatly appreciated.

Cheers,


Pete

 

[gas4you]

Could you not fit an E7 direct cylinder with two 11" immersion's in the side, top and bottom?

This would be better for economy and amount of HW.

Yes to your questions about pipe sizes

 

[swbjackson]

No point fitting a 42 18 with a 27" Immersion heater. You may as well stick with a 36 18 or go for the E7 as gas4you says.

Don't use boss white and hemp for the cylinder connections as they are not suitable for wholesome water. Use ptfe or loctite 55 and a wras approved jointing paste such as jet blue, slictie etc.

 

[kevplumb]

No point fitting a 42 18 with a 27" Immersion heater. You may as well stick with a 36 18 or go for the E7 as gas4you says.

Don't use boss white and hemp for the cylinder connections as they are not suitable for wholesome water. Use ptfe or loctite 55 and a wras approved jointing paste such as jet blue, slictie etc.

who drinks hot water

and the last hank of hemp a took home just sent the dog loopy he is still here tho

 

[Peter W]

Thanks for your input guys, really appreciate it.

I've already got the 42 x 18 i'm afraid, but now realise a 36 x 18 would have done considering the length of the immersion heater and how much of the cylinder it will heat.

Should they have enough hot water though with this set up?

Do all immersion heaters have a built in 'stat? Also, do i just put the immersion heater washer in dry or do they need something on the faces of the washer first?

I normally fit bathrooms so i'm a bit green to all this.

 

[bengasman]

I normally fit bathrooms so i'm a bit green to all this.

No problem, better green than Brown.

 

[swbjackson]

Put a thin smear of jointing paste on the washer.

 

[Peter W]

Thanks for that, something like Jet Blue Plus?

Also, any feedback on my questions about the 'stat and the quantity of hot water they will have?

Sorry for all the questions, nearly there now and then i'll get back to doing bathrooms.....

 

[swbjackson]

Most Immersion heaters contain a stat. To get more hot water you could fit a 36" immersion.

http://www.tlc-direct.co.uk/Products/IH336TC.html