Unvented cylinder size

[Notagainpike]

200/210 or 250l indirect unvented cylinder...

Pros and cons of both please guys, whats the thinking??
Better to go bigger, or are there other considerations to be thought of....?

 

[Notagainpike]

Also I would recommended sealing the system as the cylinder is in the loft high chance of pumping over

What do you mean by sealing?

 

[Notagainpike]

Depends where you are. But we’re billing out at £300+VAT per day per man, plus your materials. So it’s probably not a million miles away.

Yeah, 360 a day, what is a plumbers day??
Wheres that abouts??
I wouldnt be suprised by that sort of figure....but 450ish seems crazy in south west

 

[ShaunCorbs]

3 days for 1 man?
NO, no soil vent, but there are easy options for discharge i would think...

Yes or 4 if it’s a pain discharge has to be copper or high temp plastic and if over x m it has to be 28mm it can’t be overflow tube

 

[ShaunCorbs]

What do you mean by sealing?

Expansion vessel and filling loop for the heating system instead of a f and e tank

 

[Notagainpike]

Expansion vessel and filling loop for the heating system instead of a f and e tank

I see. Wasnt going to bother pressurising the heating tbh. At present anyway... is this the best way to go?
What are the afvantages of doing this??

 

[Notagainpike]

What do you mean by sealing?

Why high chance of what pumping over??

 

[ShaunCorbs]

I would as your having the cylinder in the loft better heat up times customers report and not open to atmosphere so better water quality if flushed

 

[ShaunCorbs]

Why high chance of what pumping over??

You haven’t much head from the top of the cylinder coil and bottom of the f and e tank at present you have around 2.4m ish with a cylinder in the loft maybe 1-1.5 m max

 

[Notagainpike]

You haven’t much head from the top of the cylinder coil and bottom of the f and e tank at present you have around 2.4m ish with a cylinder in the loft maybe 1-1.5 m max

Sorry boss, you lost me.....am i right in thinking the f+e tank needs raising as high as possible above the cylinder??

Its a bungalow...

 

[ShaunCorbs]

Yes you want a min of 2m above the coil of the cylinder to the bottom of the f and e tank

 

[Notagainpike]

Yes you want a min of 2m above the coil of the cylinder to the bottom of the f and e tank

This isnt possible🤷🏽
Why has no one onsite mentioned this 2m min??

 

[ShaunCorbs]

Think of your current height and coil height bet that’s over 2m

 

[EvilDrPorkChop]

Easier just to seal as @ShaunCorbs says. No point going to the effort to raise the tank.

£360 is up North, so £450 South West is probably not bad 😂

Don't forget, pay cheap pay twice. Good labour costs.

 

[Notagainpike]

Think of your current height and coil height bet that’s over 2m

Cws tank to current vented cylinder....yes.
Why does the feed and expansion for the boiler need to be a mimimum 2m??

 

[Notagainpike]

Easier just to seal as @ShaunCorbs says. No point going to the effort to raise the tank.

£360 is up North, so £450 South West is probably not bad 😂

Don't forget, pay cheap pay twice. Good labour costs.

Its mad...things are going to crash soon...people simply arnt earning enough to pay the trades going rates
...

 

[ShaunCorbs]

Cws tank to current vented cylinder....yes.
Why does the feed and expansion for the boiler need to be a mimimum 2m??

To have a high resistance so when hot water only is on it doesn’t pump over

 

[Chuck]

Its mad...things are going to crash soon...people simply arnt earning enough to pay the trades going rates
...

Don't like their price? Then just ask another firm to give you a quote.

 

[Notagainpike]

To have a high resistance so when hot water only is on it doesn’t pump over

Thanks Shaun....think i need to rethink or fully understand what im needing ot what people are trying to inatall!....

 

[Notagainpike]

Don't like their price? Then just ask another firm to give you a quote.

and there lies the problem. Ring and leave messages and never get a response!
6 different people...😫

 

[Sparkgap]

To have a high resistance so when hot water only is on it doesn’t pump over

You are assuming the feed and vent are connected either side of the boiler? I'd have the feed and vent both on the suction side of the pump on a low head system, no pumping over and only consideration is enough head to prevent cavitation.