Greenstar Condensing Boiler 24 Ri big enough for job?

[davidw]

We've just moved into a house with the Greenstar condensing boiler. It seems to be struggling a little in that if you're running a bath and someone puts the dishwasher on then it's as if it can't cope. We've come from a combi Boiler and this seems a little ropey in comparison. Maybe I'm expecting too much from this type of boiler? any advice appreciated.

 

[Chuck]

It seems to be struggling a little in that if you're running a bath and someone puts the dishwasher on then it's as if it can't cope.

What exactly do you mean by "can't cope"? Can we assume that the dishwasher is not plumbed into the hot supply? If so, the problem is more likely to be the capacity of your incoming water supply and/or the pipework feeding the boiler and dishwasher.

Anyway, lets start with the simple stuff, is the stop-cock properly open?

 

[Scott_D]

Vented or unvented cylinder?

 

[magicno1]

It’s a regular heat only boiler not a combi to start

 

[davidw]

I think you may be right about the capacity of the incoming water. I've made sure the stopcock is turned fully on. If I'm running several hot water taps then the system seems to struggle with producing enough water. I thought it might be the boiler not able to heat enough to meet demand, but the more I think of it, the water pressure does seem low.
[automerge]1580832532[/automerge]

It’s a regular heat only boiler not a combi to start

Yes, as I said, we moved from a combi to this condensing boiler.

 

[centralheatking]

I think you may be right about the capacity of the incoming water. I've made sure the stopcock is turned fully on. If I'm running several hot water taps then the system seems to struggle with producing enough water. I thought it might be the boiler not able to heat enough to meet demand, but the more I think of it, the water pressure does seem low.
[automerge]1580832532[/automerge]

Yes, as I said, we moved from a combi to this condensing boiler.

Go to the outside tap and discharge a monitored volume of water over 1 min and see what volume.
Do this at peak time just before school on a weekday, again in the evening peak and about 6am on a Sunday and let us know what you find. Just check the outside tap is on the mains There is a relationship between pressure and volume but you are looking at volume Centralheatking

 

[EvilDrPorkChop]

I think you may be right about the capacity of the incoming water. I've made sure the stopcock is turned fully on. If I'm running several hot water taps then the system seems to struggle with producing enough water. I thought it might be the boiler not able to heat enough to meet demand, but the more I think of it, the water pressure does seem low.
[automerge]1580832532[/automerge]

Yes, as I said, we moved from a combi to this condensing boiler.

That’s because you’ve probably got a gravity fed hot water cylinder and not a pressurised system. Have you got tanks in your loft?

 

[davidw]

That’s because you’ve probably got a gravity fed hot water cylinder and not a pressurised system. Have you got tanks in your loft?

No tank in loft, only cylinder on landing.
Cheers.
[automerge]1580841527[/automerge]

Go to the outside tap and discharge a monitored volume of water over 1 min and see what volume.
Do this at peak time just before school on a weekday, again in the evening peak and about 6am on a Sunday and let us know what you find. Just check the outside tap is on the mains There is a relationship between pressure and volume but you are looking at volume Centralheatking

Will do!

 

[EvilDrPorkChop]

No tank in loft, only cylinder on landing.
Cheers.
[automerge]1580841527[/automerge]

Will do!

Picture of cylinder might help.

 

[davidw]

Hi, I've measured the output and it's averaging at 1 litre per 10 seconds. That's with nothing else being used. Is this low?