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Oct 17, 2017
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Somerest
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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....?
 
You also might want to consider ACV tank in tank cylinders. You can get away with smaller because of their rapid reheat ability.
 
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?
 
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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
Looks nice and compact, id not seen these....wired for priority hot water...is this just a change in the control box wiring??
 
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?
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....
 
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.
 
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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??
 
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??
 
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.
 
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How many bathrooms?

If 1, another option is to put in a plate heat exchange and go instantaneous with no store of hot water...
 
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.
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
 
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No go for the plate heat exchanger with your current sized boiler.
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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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 .
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....😫
 
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....😫
Here's one I recommend around £500 . Kop
 

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Lost how mate? A new boiler and unvented cylinder with the boiler wired to a external weather sensor , I've recommended a water softener above . Kop
SO, at present im on a y plan, am i right in thinking, with an unvented a cylinder, it would be best to change over to an s plan, with the two valves close to the boiler? And if so, do i require an extra 5 or 6 core wire to link up new valves,??
If the y plan stays, i assume the new valve just goes near the cylinder somewhere and gets wired to the control centre....

Just want to try and do half a job! But do it right once!
New boiler is a bit costly at present...
 
SO, at present im on a y plan, am i right in thinking, with an unvented a cylinder, it would be best to change over to an s plan, with the two valves close to the boiler?
Weather compensation, if that's what you are still considering (I've lost track), is incompatible with standard S-plan with a cylinder as one zone because most of the time the CH water is below the 65°C minimum needed to heat the cylinder.
 
Various ways to do it but here's the Ideal wiring diagram for their heat only boiler and unvented cylinder with a outdoor sensor installed .Kop
 

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SO, at present im on a y plan, am i right in thinking, with an unvented a cylinder, it would be best to change over to an s plan, with the two valves close to the boiler? And if so, do i require an extra 5 or 6 core wire to link up new valves,??
If the y plan stays, i assume the new valve just goes near the cylinder somewhere and gets wired to the control centre....

Just want to try and do half a job! But do it right once!
New boiler is a bit costly at present...
5 core and basically yes I'd change the 3 port to two or even 3 - 2 ports zone valves does your property need to be as warm upstairs as it does downstairs?
 
Bungalow....
Big bungalow? Still applies bedrooms and living areas can be split up all these little things add up to more control over your heating and savings on energy, the one big thing to remember is insulation 350 mm in your loft space is now the norm walls , floors I'd do the lot if I could in reality you probably can't 🙂 but just do what you can.
 
Big bungalow? Still applies bedrooms and living areas can be split up all these little things add up to more control over your heating and savings on energy, the one big thing to remember is insulation 350 mm in your loft space is now the norm walls , floors I'd do the lot if I could in reality you probably can't 🙂 but just do what you can.
4 bed, yeah, i suppose its big by todays standards, 80s...so insultaion is poor at least...on a hill to, so we catch the easterly blows!
 
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As KoP suggested the best thing you can do to improve efficiency and comfort is to improve insulation - it really can't be overstated!
Weather comp is underrated too I think and is definitely possible with s-plan type setup. You could search for X-plan as an option, it does start to get a bit technical but well worth a try.
 
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I just re-read this. I first read it as no more than 7 minutes at a time. Apologies, how long are you in there? 7 minutes is a long shower in my book. If it's going to be over 10-12 min each one after another, go bigger.
No idea! Ive never timed it tbh!!
I have more on my plate than thinking about shower times at present....selfish but true....shower time is my escape, my down time
 
Tbh i'd go off local recommendations from people who have actually used someone.
Agreed. Alternatively, if that doesn't work, try the cylinder manufacturer's website. They'll usually list several 'approved installers' for your area. They'll have done the manufacturer's product-specific training and you may get a longer warranty if you use them.
 
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Is that INC VAT and you supplying all the materials and sourcing them? Or they sorting materials too.
Thats purely the labour content.inc vat. I have the cylinder, they say to supply pipe and fittings. Plus 1 zone valve.
Change y to s plan.
Move mag filter, as apparently its only on heating return and doing nowt for the boiler.
Raise f+e tank in loft.
Fit cylinder in loft on platform ive built.
Pipework to be run up new airing cupboard wall. Its a blank canvas in my book...

Am i so out of touch with life in 23!!?
 
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
 
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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.
 
Like this. Both cold feed and vent on the flow pipe off the boiler.
 

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