Can I have a new combi boiler and keep my hot water cylinder

[Agile]

Under the "Vented mains pressure system" table it states : No loft tanks - space saving

you cannot put mains pressure into a vented system, it would just overflow!

Never assume everything you read is correct !

Tony

 

[blondebier]

You already said that...

I guess it depends on where you put the mains pressure in the system.

 

[doitall]

Thermal stores will do what you want, and give you mains pressure hot water. Plus you can add solar if have a south roof.

The best stores have a small header tank.

Do a google for Telford stores.

And I still don't like the sludge buckets, but they do a job.

 

[blondebier]

Sludge buckets?

 

[ajrobb]

That sounds fairly clear to me. It doesn't state or even imply that it is a gravity fed system that utilises a storage tank in the loft.

If it doesn't use a storage tank, it will use a header tank. I doubt an expansion vessel would be safe enough for a vented cylinder.

 

[blondebier]

Yes, they're integrated into it.

See an example here :

http://www.newarkcoppercylinder.co.uk/cylinders/thermal_store

There's a diagram of the innards towards the bottom of the page.

 

[kevplumb]

And I still don't like the sludge buckets, but they do a job. icon_rolleyes.gif
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by that took a while

 

[picasso]

I havent read the whole thread sooooo what happened, has the op decided to put a new mains in, or does he/she think a thermal store is going to magic up more than 16 litres a minute ?

 

[doitall]

I havent read the whole thread sooooo what happened, has the op decided to put a new mains in, or does he/she think a thermal store is going to magic up more than 16 litres a minute ?

The Op wants a new boiler with mains pressure hot water, but keeping a cylinder at the same time.

An unvented is not really suitable below 20Ltrs/min as has been said, so the suggestion is a thermal store.

 

[JohnD]

a thermal store running off the mains is not going deliver more than the main can

 

[mehran]

if it was me i would bung in a break tank and pump the whole lot...

with a vented tank with high recovery coil in it you make it hot water priority with weather comp and dhw cylinder sensor.

did a job like that and got the bath hot tap from 8L/M (off the mains combi) to 22+L/M of the pumped vented tank

 

[doitall]

if it was me i would bung in a break tank and pump the whole lot...

with a vented tank with high recovery coil in it you make it hot water priority with weather comp and dhw cylinder sensor.

did a job like that and got the bath hot tap from 8L/M (off the mains combi) to 22+L/M of the pumped vented tank

Do you mean unvented tank Mehran

Break tank and twin pump set, and blast the building with 3bar, 30-40 ltrs/min

 

[mehran]

the last job i used a vented tank but yes unvented tank most likely better. that way you can just pump cold water to the tank up stream for it.

 

[Agile]

Thermal stores will do what you want, and give you mains pressure hot water. Plus you can add solar if have a south roof.

The best stores have a small header tank.

Do a google for Telford stores.

Google lists all the stores in Telford, Debenhams, Top Girl, Next etc, but none of them have any header tanks, tank tops then yes!

 

[doitall]

You can connect the boiler direct to the store, not the coil, and use a heat bank for the hot water, and have a very efficient boiler.