Do I need a hot water tank/cylinder jacket?

keystone

You will have as a minimum:

1. Flow from boiler
2. Return to boiler
3. Vent to roof with hot taps teed off that.
4. Cold supply from roof.

You may have

5. Separate drawoff for shower either via surrey/york flange where the vent comes out or via essex flange out of the side of thr cylkinder.

Is your sixth pipe actually the flow via a motorised valve to the CH?

Any chance of a pic?

Cheers

keystone

Oh this is a conventional open vent cylinder is it or is it an unvented? My poost above assumes the former.

Cheers

cyclonebri1

The title "airing cupboard" is the clue.
Although they weren't designed to give off heat, it was inevitable in days gone by so they used to "air" clothes in there.
Now insulation is better, pre insulated HW cylinders are the standard. But there is still a little leakage, which is why the cyl feels warm to you.

You need to decide if you want to let this small amount of heat add to the existing room/clothes heating?, or spend more on insulation to keep the heat in the system.

gas4you

All pipes off the hot water cylinder must be insulated for a minimum of 1m or until they disappear into a wall, floor or ceiling.

jonny2510

keystone wrote: »

You will have as a minimum:

Any chance of a pic?

Ok I lied, there weren't six pipes... there were seven!!!

Pipes 1 (left),2 (insulated),3 (15mm copper) & 4 (plastic)


Pipe 5 (under thermostat) and 6 (insulated on right)


Pipe 6 (again) and pipe 7 (bottom)


Overall image of HWT

jonny2510

jonny2510 wrote: »

If fact there are 8 pipes in/out of the boiler - I've just noticed another one behind the Dettol bottle, lower left.

If anyone can offer comment as to what they are/might be, I'd be interested to know

cyclonebri1

It gets complicated with a system with a pressure vessel like that, I'll bow out and let one of the installers enlighten you, (and me):o

keystone

Looks like an indirect combination cylinder. What does the label say - can't make it out?

No it won't need additional insulation to answer your primary question.

Cheers

jonny2510

keystone wrote: »

Looks like an indirect combination cylinder. What does the label say - can't make it out?

It says "140 x Direct Mainsheat Cylinder". It also says Kingspan & Copperform on the label...

keystone

Ahh OK so its a thermal store. Works differently to your standard cylinder. The water in the cylinder is kept permanently hot and the coil is used in the reverse direction so that you pass cold water through it and the cylinder heats the water in the coil rather than the other way round. Hence the blending valve to moderate the temperature of the hot water going to your taps which will be at mains pressure.

Because its all at mains pressure you have the expansion vessel (grey cylinder) to perform the same function as it would with a combi boiler.

The bubble at the top is a static cold water store so yes the plastic pipe will be an overflow.

It also provides the hot water for your central heating.

Theres obviously a boiler somewhere? The backup immersion heater doesn't appear to be connected.

Cheers