DHW cylinders?

d o'c

I need a 250L vented cylinder. One coil, emersion.
Are these all of similar quality these days, are there any recommended types from the guys fitting them on a regular basis.
Do they come with pockets in the insulation for stats/temp display?

Folks place still has an unlagged cylinder( usually lagged with clothes!!), and you had to touch it to see if it was ok for a bath:D.

So on my system I'd like nice temp display, plus stat to switch pump

Marcanthony

d o'c wrote: »

I need a 250L vented cylinder. One coil, emersion.
Are these all of similar quality these days, are there any recommended types from the guys fitting them on a regular basis.
Do they come with pockets in the insulation for stats/temp display?

Folks place still has an unlagged cylinder( usually lagged with clothes!!), and you had to touch it to see if it was ok for a bath:D.

So on my system I'd like nice temp display, plus stat to switch pump

What size is your cylinder at present and if your going to go through this expense why not pressurise the cylinder.

sullzz

d o'c wrote: »

I need a 250L vented cylinder. One coil, emersion.
Are these all of similar quality these days, are there any recommended types from the guys fitting them on a regular basis.
Do they come with pockets in the insulation for stats/temp display?

Folks place still has an unlagged cylinder( usually lagged with clothes!!), and you had to touch it to see if it was ok for a bath:D.

So on my system I'd like nice temp display, plus stat to switch pump

Stainless steel cylinders are just as cheap as copper cylinders nowadays , but if you want a copper one you can get it made to anyway you want , coppercraft make it to your spec with connections where you want them , ring dpl or call in to give your spec

d o'c

new build...
going with large solid fuel boiler, through systemlink, 1zone of systemlink going to DHW coil

Marcanthony

sullzz wrote: »

coppercraft make it to your spec with connections

Coppercraft no longer make cylinders they import them to your spec.They are no longer based in ballyfermot . they have a unit in tallaght now.
However there is cheaper manufacturers that make them in ireland instead of importing them.

Ther old premises where they manufactured them was a great set up. you use to be able to bring in an unlaged cylinder and they would insulate it for you (on their foam machine).
Anyone know who does this now.

d o'c

I got 2 prices so far one was twice as much as the other (both copper)
I was just getting ballpark figures. So why the big difference I wonder.

Marcanthony

d o'c wrote: »

new build...
going with large solid fuel boiler, through systemlink, 1zone of systemlink going to DHW coil

sorry didnt notice you said folks place.
As scullz said you can get them stainless steel and to the spec you require.

d o'c

thanks.;)

More work to do then I'm off shopping for a tank:)

Marcanthony

have you tried buying on line. since you have the spec you need ect. I personally have never bought any materials on line. but i have seen sites selling cylinders ect at a much lower cost.

antoinolachtnai

One difference is how fast the recovery of the tank is. This is basically how much surface area the heating coil from the central heating has. A good tank has more surface area on this coil and so will heat up the water faster.

I have an oldish tank, and it can't keep up with the power my boiler puts out at all.

d o'c

Marcanthony wrote: »

have you tried buying on line. since you have the spec you need ect. I personally have never bought any materials on line. but i have seen sites selling cylinders ect at a much lower cost.

I have been looking, here and in uk.
With say a UK tank does the irish vs metric fttings come into play here. Are special adaptors required ?

d o'c

antoinolachtnai wrote: »

One difference is how fast the recovery of the tank is. This is basically how much surface area the heating coil from the central heating has. A good tank has more surface area on this coil and so will heat up the water faster.

I have an oldish tank, and it can't keep up with the power my boiler puts out at all.

I've seen a system where 2 coils were connected in parallel, and I'd imagine it's for the reasons you mention. Plenty output from boiler, so 2 coils working together faster recovery for DHW cylinder.

JohnnieK

d o'c wrote: »

I have been looking, here and in uk.
With say a UK tank does the irish vs metric fttings come into play here. Are special adaptors required ?

Use Irish rings with them. Compress, loosen and then plenty of boss white before tightening back up.

Have a look at Gledhill, there cylinders come with Irish nuts and rings.

kscobie

Do not fit a stainless steel cylinder on a well, as it states in the small print that if you do, the warranty is void.
Simply, on a water mains, fit stainless steel, if desired, and if on a well, only fit copper.
I found this out the hard way:)

freddyuk

kscobie wrote: »

Do not fit a stainless steel cylinder on a well, as it states in the small print that if you do, the warranty is void.
Simply, on a water mains, fit stainless steel, if desired, and if on a well, only fit copper.
I found this out the hard way:)

I am investigating this issue so can you elaborate please? Time frames / effects? Is it a problem at the joint of different metals. Were you using a standard indirect cylinder? If so where did it fail exactly?
Thanks

freddyuk

freddyuk wrote: »

I am investigating this issue so can you elaborate please? Time frames / effects? Is it a problem at the joint of different metals. Were you using a standard indirect cylinder? If so where did it fail ?
Thanks

For the thousands of S/S unvented cylinders direct and indirect that are sold every year that i look after under warranty i may get 2-3 a year that fail from well water, it's mainly the stat pockets , I get round this by swapping them for titanium pockets from Viessmann.

It would be rare for the cylinder it's self to fail but it happens, the time is dependent on the quality of the well water and has no patten.

freddyuk

gary71 wrote: »

For the thousands of S/S unvented cylinders direct and indirect that are sold every year that i look after under warranty i may get 2-3 a year that fail from well water, it's mainly the stat pockets , I get round this by swapping them for titanium pockets from Viessmann.

It would be rare for the cylinder it's self to fail but it happens, the time is dependent on the quality of the well water and has no patten.

So it is a component in/on the cylinder which fails but not the cylinder itself? I can see how the pockets themselves could be a weak spot if they are thin steel and overlooked as the pocket may not be the same quality as the cylinder itself. I wonder if that is covered by the quality control process.

freddyuk

freddyuk wrote: »

So it is a component in/on the cylinder which fails but not the cylinder itself? I can see how the pockets themselves could be a weak spot if they are thin steel and overlooked as the pocket may not be the same quality as the cylinder itself. I wonder if that is covered by the quality control process.

It's only a problem with well water, if it happened more often then I think they'd change the pockets.
well water can attack welds in extreme cases hence the get out of jail instructions in the warranty.

freddyuk

gary71 wrote: »

It's only a problem with well water, if it happened more often then I think they'd change the pockets.
well water can attack welds in extreme cases hence the get out of jail instructions in the warranty.

I have a cylinder on well water but it is direct from wbs/solar so no new water is getting into the cylinder so I am wondering if it is safe based on the fact there is no aerated water getting into the system. Unless it is something else in well water ie. simply ph level which can be altered if required on a sealed system. Any thoughts?

I would talk to the manufactures of your cylinder about any queries you have.

If I have a problem that I can't put to bed then I ask the customer to get a report on the water by sending off a sample, I then send off the report to people cleverer than me for some direction on what we can do.

I have been told 3rd hand that the issue is with the PH levels which allow for more aggressive electrolysis, but I'm not clever enough to argue the point.