Calculating the water volume of a heating system

[sheff paul]

If the existing vessel is sound and the pressure is rising excessively when heating up whack another one in? an Additional 8 litres should suit most applications?

Or do you want water content per metre info?

spot on ,normally if space is tight a pull out the old vessel and bang in a 12 on sealed symstems,did water content years at college ago ,never remembered it.

 

[ManchesterGas]

Attach a hose and drain it into a bucket and see show many time you have to empty the bucket. Add a bit on if the drain is higher than the lowest point and have fun if it's a drop system!

 

[SafeGasInstall]

Attach a hose and drain it into a bucket and see show many time you have to empty the bucket. Add a bit on if the drain is higher than the lowest point and have fun if it's a drop system!

cleaver idea I will just add 5 or 10% to this volume as you will have water left in the pipe work and bottom of rads

 

[tamz]

Raise the pre-charge pressure if it is near the limit for the vessel size.

 

[sheff paul]

Raise the pre-charge pressure if it is near the limit for the vessel size.

that will put the system under higher pressure and activate prv on full load usage

 

[doitmyself]

Heating load wise on domestic its 6 litres per KW heat load so 18kw heat only would be 12kw x 6l = 72L

Really?? Shouldn't it be 18 x 6 = 108 litres??

 

[sheff paul]

Really?? Shouldn't it be 18 x 6 = 108 litres??

ive got a 18 kw system boiler in my gaff,its fitted with 8 litre vessel g/worm flexicom

 

[tamz]

that will put the system under higher pressure and activate prv on full load usage

No it won't

 

[sheff paul]

No it won't

less flex on diaphramn due to more charge pressure=more system pressure......

 

[sheff paul]

less flex on diaphramn due to more charge pressure=more system pressure......

i will take some of this back you can increase the pressure to suit static head..

 

[Pope John 2]

Can anyone give me a specific way to calculate the water volume within a heating system? I'm trying to work out if an existing installation would benefit from an expansion vessel.

Mr Combi Training has an android app for rads and expansion vessels and lots more most are free and brilliant

Mr Combi: Combination Boilers, boiler installation training Bedford UK