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Unvented cylinder size

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Notagainpike

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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....?
 
Oso cylinders are also a good choice recently fitted this one I'd of thought 210 litres would be enough for 2 people but if your taking long showers and baths stagger the heating and primary heat times or get your system wired for priority hot water . Kop
 

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How many bedrooms (how many people could comfortably live there)
Is it likely to increase from the two of you?
Do you both shower or use the bath? If you use the bath is it daily?
Would you shower one after the other?
Average shower time in UK is apparently 7 minutes although personally I can't see how you can be in there that long.
Would you say that's correct?
What boiler is heating this cylinder? Is it a modern condensing boiler?
 
king of pipes said:
Oso cylinders are also a good choice recently fitted this one I'd of thought 210 litres would be enough for 2 people but if your taking long showers and baths stagger the heating and primary heat times or get your system wired for priority hot water . Kop
Click to expand...
Looks nice and compact, id not seen these....wired for priority hot water...is this just a change in the control box wiring??
 
Last Plumber said:
How many bedrooms (how many people could comfortably live there)
Is it likely to increase from the two of you?
Do you both shower or use the bath? If you use the bath is it daily?
Would you shower one after the other?
Average shower time in UK is apparently 7 minutes although personally I can't see how you can be in there that long.
Would you say that's correct?
What boiler is heating this cylinder? Is it a modern condensing boiler?
Click to expand...
4 bedroom, maybe will at somepoint, yes, both shower, and usually after each other, probably spend way more than 7 mins at a time tbh!
Boiler is a 330i...i think....badged as a british gas...
 
Is the genaral oppinion, that it is better to go for a smaller unit and rely on the fact that they heat recovery is quicker or go for a larger unit and heat more than maybe required, on the basis that heat loss is better than it use to be....
 
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
 
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
 

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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.
 
king of pipes said:
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
Click to expand...
Valid points taken on board...
So are you saying the smaller cylinder is the best option??
 
With the above kit any boiler is
 
Last Plumber said:
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.
Click to expand...
A 150l...🤷 really??
 
I have 170l on HW Priority and well, it's not enough (Cylinder was existing in house when we bought). 2 People at 20lpm showers. It reheats rapid (Maybe like 10 minutes), but personally if you've got the physical room i'd go with a minimum of 250l. Especially in a 4 bed house.

You don't need fancy controls. You can do it quite simply with a relay that costs £15.
 
EvilDrPorkChop said:
I have 170l on HW Priority and well, it's not enough (Cylinder was existing in house when we bought). 2 People at 20lpm showers. It reheats rapid (Maybe like 10 minutes), but personally if you've got the physical room i'd go with a minimum of 250l. Especially in a 4 bed house.

You don't need fancy controls. You can do it quite simply with a relay that costs £15.
Click to expand...
Intetesting, im listening....
🤪
 
I often spec for 'Gledhill platinum stainless indirect' cylinders. I rate them and they have the floating baffle that eliminates need for expansion vessel and adds a decent amount of accumulation that may help with your 'pressure' issues
 
Timmy D said:
No go for the plate heat exchanger with your current sized boiler.
Click to expand...
330i is a rebadged Glowmorm boiler so she's getting on a bit now probably over ten years or more but if well maintained and serviced I'd connect to a unvented cylinder or you may want to consider a boiler upgrade at the same time , but as Timmy has said not suitable for a plate heat install as it is .
 

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king of pipes said:
330i is a rebadged Glowmorm boiler so she's getting on a bit now probably over ten years or more but if well maintained and serviced I'd connect to a unvented cylinder or you may want to consider a boiler upgrade at the same time , but as Timmy has said not suitable for a plate heat install as it is .
Click to expand...
Yeah, thats the one, it still works and gives us heat! Its bastard expensive to run mind...
Im not against upgrading it, but i need to justify the cost against the working unit tbh...

Water softners a thing to look at....? Whats the best thing without spending a million bucks....😫
 
Never had a problem with Monarch water softeners and reasonably priced , I'd maybe think hard and get both boiler and cylinder done fit weather compensation is a must now to save energy. Kop
 

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Notagainpike said:
Yeah, thats the one, it still works and gives us heat! Its bastard expensive to run mind...
Im not against upgrading it, but i need to justify the cost against the working unit tbh...

Water softners a thing to look at....? Whats the best thing without spending a million bucks....😫
Click to expand...
Here's one I recommend around £500 . Kop
 

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