I need to upgrade my Baxi 80 Eco combi boiler

[DP]

Vokera Flowmatic 20-80
Vokera Excel 80SP
Potterton Puma 80
Ideal Response 80
Potterton Combi 80e
Baxi 80e

I would look for stipulated flowrate at designated temperature (35 degree C) rise for confirmation of correct operation.

 

[francspencer]

Ok, will check the floe rate at the kitchen hot water tap tommorow after work.
The boiler I was looking to buy is the Baxi platinum.

Will turning the hot water dial on the boiler to max make a difference to the flow rate..? I was under the impression this is more like a temperature gauge for the water..

Thanks for all the comments so far.

 

[mickyg]

Vokera Flowmatic 20-80
Vokera Excel 80SP
Potterton Puma 80
Ideal Response 80
Potterton Combi 80e
Baxi 80e
.

are you saying these are 20kw boilers? just for clarification

 

[DP]

Error on my part- 24kwatt not 20 (Just checked)

 

[francspencer]

Just measured the flow from the kitchen tap which is located 1.5 meters above the boiler and 5 meters horizontally away.

Hot water = 2 litres in 20 seconds
Cold water = 2 litres in 16 seconds

Any advice would be greatly appreciated..

 

[twgas]

2 litres in 16 secs = <8 litres/min.
you've not got enough water coming in to the house to worry about the size of your boiler.

 

[francspencer]

I'm in a terraced house, which is divided into 3 appartments, mine being the 2nd floor and loft.

How do I go about having the mains flow rate increased, I checked the tap in the ground floor and its fully open..?

 

[francspencer]

any advice would be greatly appreciated..

 

[bengasman]

Measure how long it takes to fill a bucket with COLD from each tap. Then do the same with HOT from each tap. Keeping notes would be an idea for later on to compare.

 

[kevindgas]

OP aside from the fact you can only get out, what comes in so your main is probably too small there are several other factors.

isolation valves - you need full bore ones to prevent a restriction in flow (not very expensive)
pressure equalising valve - can help to reduce flow on the cold and allow a better flow on the hot by keeping both pressures equal.
boiler size - a 24Kw combi is and always will be pants at hot water production if you are going to replace it upgrade to a minimum 30Kw one
we use vaillant Ecotec 831's most of the time and never had any flow/ temperature issues.
Elbows in pipework- the more there are the greater the restricition in flow a nice bend instead will help improve flow but only a very small amount.
Cheapo EU taps - the likes of which are sold by sheds and discount stores often have 12mm pipe runs in mind when they are designed and don't really like our 22/15mm systems
old pipes - again if you have any iron pipes they are more than likely furred up or corroding internally
22mm pipes best avoided with a combi system as the amount of water in them means it will allow too much flow through the boiler so it won't get hot enough.