Combi boiler with built in storage tanks

[ey143]

We have no room for a traditional storage tank and currently have a 29kw Worcester Bosch Greenstar CDi combi. Thinking of changing this as we will have to move it due to an extension. 3 bathrooms and 1 WC, 13 radiators 5 bed semi-detached. Current boiler onlt delivers 11 litres per min, so cant run two showers at once and if someone opens the tap, show upstairs goes cold for a bit.


Am thinking of a combi will built in storage. The Viessmann Vitodens 111-W 35kW Storage Combination Boiler Natural Gas ErP is 480mm in depth where as the Worcester Bosch and Valliant are both 600mm which would get in the way of our door.

Any feedback on this particular boiler model?

 

[CWHEATING]

I doubt any combi boiler can run two showers at the same time. Your gonna need a stored hot water system or a instantaneous water heater.
Best bet is to get an engineer to cap off the hot water side to your combi and fit an a water heater that can supply the correct amount of litres to feed all your hot water outlets.

 

[Dan Robinson]

Love it extending a house to 5 beds and 3 bathrooms but won't leave decent space for proper equipment to be fitted.

 

[CWHEATING]

Love it extending a house to 5 beds and 3 bathrooms but won't leave decent space for proper equipment to be fitted.

LMFAO !

 

[stonehouse]

Best bet is to get an engineer to cap off the hot water side to your combi and fit an a water heater that can supply the correct amount of litres to feed all your hot water outlets.

Isn't the hot water side of a combi boiler an instantaneous water heater?

 

[CWHEATING]

Isn't the hot water side of a combi boiler an instantaneous water heater?

Yes it is but no way on earth is it going to be able to feed two showers and all the other hot water outlets in his house.

 

[bernardgreen]

Isn't the hot water side of a combi boiler an instantaneous water heater?

Not "instantaneous", but more accurately "on demand". They are not instantaneous because before any hot water can be produced one or two heat exchangers inside the boiler have to be heated.

 

[muggles]

Any feedback on this particular boiler model?

It's not suitable, for that size house you need a boiler and separate unvented hot water cylinder. It can be a small cylinder though, with the right setup. An Intergas boiler connected to a Joule Cyclone cylinder set up to hot water priority would be a great combination. The cylinder can be positioned underneath the boiler so it shouldn't take up much more room than the eleventyone

 

[CWHEATING]

It's not suitable, for that size house you need a boiler and separate unvented hot water cylinder. It can be a small cylinder though, with the right setup. An Intergas boiler connected to a Joule Cyclone cylinder set up to hot water priority would be a great combination. The cylinder can be positioned underneath the boiler so it shouldn't take up much more room than the eleventyone

No point having a small tank that will run after two ten minute showers.

 

[muggles]

No point having a small tank that will run after two ten minute showers.

It won't run out if sized and set up correctly

 

[Dan Robinson]

Intergas eco RF 24 or 30, 250 litre joule cylinder on a D plan will pretty much run good showers indefinitely.

 

[CWHEATING]

Intergas eco RF 24 or 30, 250 litre joule cylinder on a D plan will pretty much run good showers indefinitely.

He said he had no room for stored hot water.

 

[Dan Robinson]

He needs a reality check.

 

[CWHEATING]

He needs a reality check.

And a gas pipework upgrade if he goes for a water heater.

 

[ey143]

I did mention that it has built in water storage. What I didn't write is that the built in tank is 46 litres and the Viessman spec says it is comparable with a 150 litre storage cylinder.

https://www.viessmann.co.uk/en/resi...ers/gas-condensing-boiler/vitodens-111-w.html