Running a combi without hot water.

[siricosm]

It seems combi boilers are now cheaper than regular or system boilers, in some cases by quite a bit. I suppose they make a lot more of them and it is just economics of scale.

Is it possible to install a combi and just leave the hot water disconnected, and/or turn it off? I am pretty sure you can do this with some of the Intergas boilers, but is this possible with most other makes as well?

 

[exedon2]

We have fitted a number of 24kw logic combi's as system boilers because of price difference.

 

[SimonG]

Or just run hot water to a single outlet. Kitchen sink or utility room sink or even a shower

 

[Knappers]

I've never done it but can't think why it would be a problem.
May be a bit of false economy if you ever end up replacing the diverter tho...
Would like to see an option for using a mini cylinder/accumulator fed by combi too.

 

[siricosm]

Or just run hot water to a single outlet. Kitchen sink or utility room sink or even a shower

I was thinking of putting the boiler up in the loft, and would rather not have to run extra pipes up there if possible.

I had an old Vaillant in a previous house, and it looked like they used the same boiler for system and combi. Mine was a system boiler and it was just missing the bits for hot water, the diverter, exchanger, etc. I am not sure if they are all like that, but it seems a bit cheeky that they would sell the exact same product for more money with some bits removed.

 

[ShaunCorbs]

Normally warranty require an outlet for the hot intergas are the only one that doesn’t

 

[siricosm]

Normally warranty require an outlet for the hot intergas are the only one that doesn’t

If I understand this right, the Intergas doesn't have a diverter. Does this mean that the DHW part of the combined exchanger sits empty if not using it for hot water? You would think this would be the worst setup if you don't want to use the hot water, but yet they allow it.

 

[ShaunCorbs]

Yep they use a dual pass heat exchanger separate heating and hot water systems