New heating system - boiler choice

bengasman said:
You may want to take the advice of morrismini with a few grains of salt, he is not a pro,
Click to expand...

Oh I'm a full pro OK, that is obvious by what I write. You are another waste of space which clutters this forum.

Unvented cylinders? With most having a pressure reducing valve to 3 bar? Nah. They restrict flow. A thermal store, or large combi, using a plate heat exchanger, can take up to 9-10 bar and no pressure reducing valves to go wrong and reduce flow. If you have over 3 bar an unvented cylinder can reduce flow/pressure.

If you have 5-6 bar main and want to us that for a high pressure power shower? Don't get an unvented cylinder.
 
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A combi, no reduce in flow, that statement alone proves you have never fitted one.
 
billy bob said:
A combi, no reduce in flow, that statement alone proves you have never fitted one.
Click to expand...

Mr Bob, if a combi say it delivers 25 litres/min at up to 10 bar, well Billy it gives that. It is that simple. What day do unvented cylinders give you on delivery rates?
 
richard-head said:
What day do unvented cylinders give you on delivery rates?
Click to expand...

everyday
happy-018.gif
 
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doitall said:
morrismini said:
billy bob said:
A combi, no reduce in flow, that statement alone proves you have never fitted one.
Click to expand...

Mr Bob, if a combi say it delivers 25 litres/min at up to 10 bar, well Billy it gives that. It is that simple. What day do unvented cylinders give you on delivery rates?
Click to expand...

Last unvented cylinders I fitted in London gave 150Ltrs/min @6bar. :LOL:
Click to expand...

Nice to know. All the combi data sheets tell you the delivery. I never see sheets telling me that on an unvented cylinder with a 3 bar pressure reducer on it with x incoming flow.

They reduce the pressure & flow, whereas a plate heat exchanger will not as there is no need for a PRV on the inlet, or any other flow restricting valve either, on,y the smaller restriction of the plate.
 
morrismini said:
They reduce the pressure & flow, whereas a plate heat exchanger will not as there is no need for a PRV on the inlet, or any other flow restricting valve either, on,y the smaller restriction of the plate.
Click to expand...

Wow! You dont even realise a plate will significantly reduce flow rates.

In fact they dont need a pressure reducer just because they create their own restriction.

Have you ever looked closely at a plate HE ?

Tony
 
Agile said:
Wow! You dont even realise a plate will significantly reduce flow rates.
Click to expand...

You must stop making things up. A 150kW plate on a Domestic house will create a small restriction.

You are not registered.
 
morrismini said:
Agile said:
Wow! You dont even realise a plate will significantly reduce flow rates.
Click to expand...

You must stop making things up. A 150kW plate on a Domestic house will create a small restriction.

You are not registered.
Click to expand...

He is really getting severely mixed up!

He is talking about a 150 kW boiler in a domestic house now!

Most domestic boilers are 12-42 kW Over 60 kW output they are classed as "commercial".

Tony
 
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