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- 9 Oct 2020
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Hi there!
I have decided to replace my boiler - I have a 2-bed 1-bath flat.
It seems that most Combi boilers have roughly the same CH output - say 24kW. The point being they are more than what most people need:- 7 rads in my flat. So it depends on the hot water required.
I have cold water mains input measured at 25 l/min at the cold tap (10 litre bucket filled in 24 seconds) and the pressure is above 4 bar when the pressure regulating value is opened.
So, in choosing a boiler based on the best shower experience possible, I have come up with the following calculations - do they seem to make sense please?!
Cold water input temp - say 10 degrees
Target showering temp - say 40 degrees
Say a 35kW boiler produces 14.3 litres / min with a 35 degree rise.
So, at the shower head / thermostatic valve:
Hot water - 14.3 l/min @ 45 degrees
Cold water - 2.4 l/min @ 10 degrees
Mixed water - 16.7 l/min @ 40 degrees
16.7l/min is a respectable shower flow rate isn't it?
Thanks!
I have decided to replace my boiler - I have a 2-bed 1-bath flat.
It seems that most Combi boilers have roughly the same CH output - say 24kW. The point being they are more than what most people need:- 7 rads in my flat. So it depends on the hot water required.
I have cold water mains input measured at 25 l/min at the cold tap (10 litre bucket filled in 24 seconds) and the pressure is above 4 bar when the pressure regulating value is opened.
So, in choosing a boiler based on the best shower experience possible, I have come up with the following calculations - do they seem to make sense please?!
Cold water input temp - say 10 degrees
Target showering temp - say 40 degrees
Say a 35kW boiler produces 14.3 litres / min with a 35 degree rise.
So, at the shower head / thermostatic valve:
Hot water - 14.3 l/min @ 45 degrees
Cold water - 2.4 l/min @ 10 degrees
Mixed water - 16.7 l/min @ 40 degrees
16.7l/min is a respectable shower flow rate isn't it?
Thanks!