10 litre unvented undersink heater

[Mgrant]

does the check valve that goes before the expansion vessel and pressure relief on a 10 litre unvented undersink heater need to be single or double?

 

[ShaunCorbs]

i always use a double but thats just because i dont keep singles on the van

 

[Mgrant]

Thanks, they usually come with a single I think? Have one that hasn't come with a check valve.

 

[ShaunCorbs]

Thanks, they usually come with a single I think? Have one that hasn't come with a check valve.

always put one on before any stored mains water

 

[townfanjon]

I would have said a single james

 

[Mgrant]

Yes I no the need for one, was just wondering if it was specific which type was used.

 

[ShaunCorbs]

Yes I no the need for one, was just wondering if it was specific which type was used.

if there isnt one supplied check mi to see which one required

 

[Mgrant]

Thanks it just say check valve no mention of single or double

 

[ShaunCorbs]

Thanks it just say check valve no mention of single or double

use a double and your covered both ways

 

[Mgrant]

Do you always use doubles on small unvented heaters is only 10 litres?

 

[ShaunCorbs]

Do you always use doubles on small unvented heaters is only 10 litres?

i dont carry singles so yes

 

[ShaunCorbs]

No need for 1, the water expands back into the cold

unless there is a pressure reducing valve fitted

 

[ShaunCorbs]

Only when pressure is above 5.5 bar so don't fit them eiver

4.5 bar