Flow Rate and boiler size

[ben phillips]

Hi all,

Having a new combi fitted in a few days and have a couple of questions, which i tought someone on here might have the answers to.

I have a choice of two boiler outputs a 28 & 33KWH i know both of these will heat my home but not sure about the DHW flow rate. The 28 gives a flow rate of 11.5 l/min and the 33 gives 13.5 l/min ive measured the flow rate at the kitchen sink with a weir gauge and it is fluxuates between 11 l/min and 14 l/min so on this info which one would you recommend.

Also the boiler is a potterton gold and was wondering what peoples thoughts on these boilers are.

Many thanks

Ben

 

[SimonJohns]

Go for the bigger one. Don't worry about what your getting out of the tap

 

[Barry98]

whats your installer recommending?

 

[Blackcatgas]

go for the bigger one, the flow rate is at a 35deg rise, ie if the incoming water is 15 degrees then the boiler will add 35deg of heat to that so the end temp out of the tap will be 50deg, if we have another winter like the last one and the temp of the water coming out of the service pipe from the ground is say 5 degrees then the water coming out of the tap will be cooler, the extra power of the 33kw will help with this on a cold day. you only relly notice this phenomina (sp?) if you have a smaller combi (24kw).
The Potterton Gold is basicly a Baxi Duotech which is a very good boiler.

 

[ben phillips]

whats your installer recommending?

Hes not really, he recons both will be fine

 

[AWheating]

what are your hot water demands?