Combi Boiler Pressures

calleyw

I have a worcester greenstar HE combi Boiler just over 9 years old.

It has not been service for a nearly 2 years I know!! Will get that sorted in the next few days.

Anyway I occasionally look at the boiler just to check water pressure.

I know how to re-fill if low. And it is normally in the green between 1-2 bar normally towards the 1bar.

I am well aware that the pressure goes up when the heating is on. But I have looked at it when it's on and it goes up to about 3 bar.

I have 0-4 bar on the pressure gauge. I know it has expansion tank which will leak if there is too much pressure.

For the life of me I can't remember if it has always got that high. Or is me just being a massive worrier lol!!!

Thanks in advance.

Yours

Calley

cajef

Your expansion vessel needs recharging, get is serviced ASAP.

calleyw

so should I use it for heating?

The 1-2 bar is obviously when its cold.

Yours

Calley

espresso

calleyw wrote: »

so should I use it for heating?

The 1-2 bar is obviously when its cold.

Yours

Calley

Should only be 1 bar when cold. What does it rise to if you lower pressure to 1 bar when cold?

calleyw

espresso wrote: »

Should only be 1 bar when cold. What does it rise to if you lower pressure to 1 bar when cold?

I looked at it today before turning the heating on and it was at 1 bar.

I have been told that needs to be in green area when cold. But I always keep it on the lower end.

The heating has been on for about an hour or so and just looking at it now its at 2.5 and earlier after having been on for about 10-15 minutes was on about 3.

Yours

Calley

espresso

calleyw wrote: »

I looked at it today before turning the heating on and it was at 1 bar.

I have been told that needs to be in green area when cold. But I always keep it on the lower end.

The heating has been on for about an hour or so and just looking at it now its at 2.5 and earlier after having been on for about 10-15 minutes was on about 3.

Yours

Calley

It does sound like Cajef is correct and your expansion vessel needs to be repressurised then. If it get over 3 Bar the pressure release valve will operate but you don't really want to allow that to happen as they often do not seal properly after operating.

calleyw

espresso wrote: »

It does sound like Cajef is correct and your expansion vessel needs to be repressurised then. If it get over 3 Bar the pressure release valve will operate but you don't really want to allow that to happen as they often do not seal properly after operating.

Ok. I have not used it much as I was worried about it as it been like this for a few weeks.

So is it safe to use until I get it serviced?

Yours

Calley

espresso

calleyw wrote: »

Ok. I have not used it much as I was worried about it as it been like this for a few weeks.

So is it safe to use until I get it serviced?

Yours

Calley

It depends just how high the pressure is reaching because if the PRV does operate (normally operate when pressure is greater than 3 Bar), you may then need a new PRV fitting, more cost. Best to get it serviced ASAP.

calleyw

espresso wrote: »

It depends just how high the pressure is reaching because if the PRV does operate (normally operate when pressure is greater than 3 Bar), you may then need a new PRV fitting, more cost. Best to get it serviced ASAP.

Thanks. Its getting up to 3 and I have bowl in the cupboard as it went once before and I had someone check it. And there is no water in it.

I have just rung someone up and see when they can come by. back to my electric heaters then LOL!!!

Yours

Calley

espresso

calleyw wrote: »

Thanks. Its getting up to 3 and I have bowl in the cupboard as it went once before and I had someone check it. And there is no water in it.

I have just rung someone up and see when they can come by. back to my electric heaters then LOL!!!

Yours

Calley

The PRV should be a copper pipe that vents outside, not inside your cupboard.

You could possibly reduce the pressure by bleeding a radiator so that it is just below 1 Bar when cold, say 0.8 but if you set it too low, the boiler may not fire up.

calleyw

espresso wrote: »

The PRV should be a copper pipe that vents outside, not inside your cupboard.

You could possibly reduce the pressure by bleeding a radiator so that it is just below 1 Bar when cold, say 0.8 but if you set it too low, the boiler may not fire up.

Oops sorry I mean the expansion tank!!!

Yours

Calley