What Size Unvented Cylinder
- Thread starter jon26
- Start date
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and finally (I think) the larger the store of water under pressure the longer a good flow rate is stored in situations of poor mains. That is to stay the accumulator effect.
So we have three benefits of larger cylinders.
Which you must also take into account when deciding where to put the cylinder how much you have to spend and how many people you want to serve.
So we have three benefits of larger cylinders.
Which you must also take into account when deciding where to put the cylinder how much you have to spend and how many people you want to serve.
The accumulator effect in the larger air gap is only a couple of seconds, so can't really be factored in a purchasing decision!
The volume vs heat loss argument is only valid for a given grade of insulation, and of course some cylinders are better insulated than others.
The volume vs heat loss argument is only valid for a given grade of insulation, and of course some cylinders are better insulated than others.
I will have to take your word for your firstpoint
your second point.. i was answering on an all other things being equal basis. That should have been obvious.
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I am sorry that you find good advice "annoying".
One wonders just what size cylinder you would expect to fit in a one bed flat.
All I can say is that 125 litres would be the size that most builders/plumbers fit. That fits well with the rule of thumb ( 50 +50+25 ) Rules of thumb have to be interpreted by a skilled person.
Tony
So in this case 50 litres per person... possibly 5 people (2 double beds and 1 single) + 50 litre = 300 litres... would you really put a 300 litre Megaflo in this scenario Tony?
Didn't think so
Thats interesting that you have ordered a cylinder when its for "your mates house"!
It sounds to me is if its you who are going to fit it even though you are presumably not qualified and will not be able to notify the installation to the Building Control.
If there were really five people living there then I would discuss the size with the owner and suggest a 300 li if their usage is high or 210 li if its lower. There is little incremental cost of a larger cylinder and an advantage if hot water never runs out.
Tony
Even if 5 people are living in the property 170/L is ample.
Its a single bathroom property and most people having a bath will spend at least 30 minutes in there giving sufficient time for the cylinder to recover.
With an 18 kw coil that shouldn't be too long.
The chances off a number of people using the en-suite shower will be slim.
Its a single bathroom property and most people having a bath will spend at least 30 minutes in there giving sufficient time for the cylinder to recover.
With an 18 kw coil that shouldn't be too long.
The chances off a number of people using the en-suite shower will be slim.
I would assume that the two sleeping in the bedroom with the ensuite would have showers and the other three baths but of course there is a shower over the bath so they could all use showers.
If the weather is very cold then the boiler output will be mostly required for heating rather than hot water and the recovery rate will be higher and could give rise to insufficient to meet the needs of the residents.
I recommend what I would want in my own house! ( The best )
Tony
Yes, 'my mate' ordered it you complete idiot. I said 'just ordered CL170HE' which he did.
It may sound to you like its me that is going to fit it but you are completely wrong, a registered G3 installer will be fitting the new HW and boiler system.
Will you ever stop being a complete and utter prat on here? Can you not leave the other pro's to it and go away?
Yes Agile, if you would spec a 250 or 300 litre for a 3 bed house 1 bath and 1 shower, I bet you would also spec a similar size cylinder for a 4/5 bed, 3 bath and single shower property too? Dosent make sense.
I have never mentioned 250li or 300 li cylinders. Its a pity you dont bother to read what people say.
I am surprised that the G3 registered installer was not asked to recommend a suitable size cylinder.
I have always said that the most important factor is the number of people living there! Its people who use hot water not empty rooms!
Tony
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