Primatic cylinder replacement problem

[tomy]

Hi all , the system is a conventional boiler with gravity dhw and pumped heating , there is a small primatic cylinder and the cylinder is leaking , The cylinder has to be replaced which is where the problems start the house is a dormer bungalow and the cylinder is in a void upstairs , the smallest primatic cylinder available is to big and wont fit in, so I thought about putting a normal cylinder in and adding a header tank but cant get any pipes from the loft down to the cylinder, so now I am thinking of a normal cylinder and making the heating circuit a pressurised system by adding a filling loop and an expansion vesel ,question is will the gravity water work ok or will it have to be fully pumped and will the antiquated boiler take the pressure ok ???? .

 

[cross thread]

your boiler will not be designd to do pressurised, bite the bullet move on to a modern system

 

[pannierstan]

You cannot pressurise a boiler unless it has an over heat protection device

 

[tomy]

The problem with replacing the boiler is that it is in the middle of the house and the flue is copex going up the chimney

 

[doitall]

Loads of old boilers cannot be converted to a sealed systemso don't even think about without passing the boiler make and model to us

 

[corgiman]

balls to sealed just pop in feed and expansion tank

 

[tomy]

I wish I could put in a f and e tank but there is no way I can get one in anywhere .

 

[Nige F]

My son`s got a wierd small tank affair on the hot outlet of his cyl. feeding the C/Heating ..I`ts the 2nd one I`ve seen in 30 years ...Now It`s gotta come out ....so maybe I could send it to you for the postage I haven`t a clue how it works but it must be some sort of remote "primatic" caper ..........anyone know my e-mail`s in my profile.......It`ll spur me on to remove it and fit a proper f+e tank

 

[weareleeds]

Under partl you cant leave a system on gravity without some control over hot water also we are finding that newer cylinders have a higher resistance so gravity circulation won't occur.Have you thought about a combi

 

[bster]

but you can buy clinders with gravity coils that are part L, also if the existing cylinder is not to be fully pumped then a 2 port valve and cyl stat will sufice (min set of controls)

 

[scaby]

it sounds like your system is knackered, why throw good money after bad? convert your system to sealed and water pressure/flow permitting (iam assuming you live in a 1 bathroom property)install a combi