Replacing primatic cylinder

[kedsy]

I want to replace my primatic cylinder, can replace it for another indirect cylinder but want to get rid of the tank in the loft. Was speaking to someone a while back who said I can replace it for another type of cylinder that doesnt require a tank in loft, is this correct? and if so what cylinder is this?

My system is a Baxi back boiler with pumped heating and gravity hw.

 

[kevplumb]

fortic elson albion take your pick

 

[brumylad]

combination cylinder.

 

[kevplumb]

here click on combi units

 

[ChrisR]

To be fair to Kedsy we need to mention Unvented Hot water cylinders.
No loft tank, but mains pressure hot water.

Price is higher but if you're taking a cylinder out anyway the fitting makes less difference. They can give you very good showers without a pump. There's a lot about them on this forum - doa search.

 

[kedsy]

Thanks for the replies. Does anyone know the average cost of one of these cylinders?

 

[kevplumb]

oooooh the moderater will get you

stand by for the see item !!!!!

 

[kedsy]

Something wrong with asking how much something costs?

Didn't want to know fitting costs , just the price of the cylinder.

 

[doitall]

Mod would have to kill you if we told how much they cost

Do a quick search on un-vented cylinders, Ariston, Megaflo, Tribune.

 

[kedsy]

Thanks, Slightly higher than what i expected but not too bad i supose.

 

[doitall]

Them is very good though provided the mains pressure and flow is good to your property.

Just to clear up a point, the Baxi Back boiler is gas and not solid fuel

 

[kedsy]

Yes, back boiler is gas. Mains pressure is good too.

 

[doitall]

Go for then you won't be sorry.

Saying that you will need to find a plumber with an un-vented ticket, and the primary circuit will need to be PartL compliant eg fully pumped Y plan so some alterations are required to the pipework

 

[kedsy]

What would happen if it was fitted as a direct replacement without making it fully pumped?

 

[doitall]

An un-vented cylinder should be fully pumped to comply with current regulations.

Gravity circulation is not recommended due to poor heating performance, in addition the cylinder has a thermal cutout which must control a 2port valve to shut off the heat source, on a gravity circuit this could present expansion and safety issues with the boiler