Unvented cylinder size

[ShaunCorbs]

On a 10 min shower at 10lpm it’s 67l hot etc so even if your doing 20 mins or 20lpm over 10 mins it’s 134l etc

Have a look at eph hot water priority kit

 

[king of pipes]

We should all be trying to conserve water not waste it there will for definite be a water shortage again this year as the weather has been to dry with no rainfall , and global warming 10 - 20 litres a minute is wasting water in my book I always install a 8 litre flow restrictor in shower heads and handsets it enough for a good shower, and save my customers money over the year, priority hot water is a good option as below but your boiler must be compatible to use this type of control and electricians often struggle to wire them mainly because there's not enough wires installed at the boiler or wiring centre . Kop

 

[Last Plumber]

A 150 is plenty in my opinion. Even if there were 4 of you it would probably cope working on 10 litres per min over 7 minutes each shower. Reheat times are quick 70% in around 18 min, full in 26 min depending on make. Don't forget, you are mixing hot and cold. Varies a bit depending on cold temperature and hot store temperature, needs assessing by installer.

I see whopping cylinders in houses these days where there is absolutely no need. Some houses have more hot water than hotels and nursing homes I have worked in.

No point heating large volumes of water just for them to sit losing heat.

 

[Notagainpike]

We should all be trying to conserve water not waste it there will for definite be a water shortage again this year as the weather has been to dry with no rainfall , and global warming 10 - 20 litres a minute is wasting water in my book I always install a 8 litre flow restrictor in shower heads and handsets it enough for a good shower, and save my customers money over the year, priority hot water is a good option as below but your boiler must be compatible to use this type of control and electricians often struggle to wire them mainly because there's not enough wires installed at the boiler or wiring centre . Kop

Valid points taken on board...
So are you saying the smaller cylinder is the best option??

 

[king of pipes]

Yes with the correct control to heat it for 2 of you its plenty .

 

[Notagainpike]

Yes with the correct control to heat it for 2 of you its plenty .

I see. Thanks for the advice, how would i tell if my boiler is able to be set up for priority hot water?

 

[ShaunCorbs]

With the above kit any boiler is

 

[Notagainpike]

A 150 is plenty in my opinion. Even if there were 4 of you it would probably cope working on 10 litres per min over 7 minutes each shower. Reheat times are quick 70% in around 18 min, full in 26 min depending on make. Don't forget, you are mixing hot and cold. Varies a bit depending on cold temperature and hot store temperature, needs assessing by installer.

I see whopping cylinders in houses these days where there is absolutely no need. Some houses have more hot water than hotels and nursing homes I have worked in.

No point heating large volumes of water just for them to sit losing heat.

A 150l... really??

 

[Chuck]

A 150l... really??

That should be enough. Whether it is or not depends on details of usage patterns that only you know, e.g. how many people you have in the house needing showers of what duration and what flow rate and how the demand is distributed over the day.

 

[Notagainpike]

With the above kit any boiler is

I find this stuff well interesting tbh...makes my day job seem well boring