Adequate HW flow for shower?

Joined
12 Jul 2006
Messages
44
Reaction score
0
Location
Yorkshire
Country
United Kingdom
Hi

I'm just deciding between two combi biolers and wanted some advice on HW flow. The lower power one can do 12.7 l/min and the higher power one can do 15.2 l/min.

I appreciate they can only acheive these rates if I've got enough mains flow (so I'll measure that tonight). On the basis that the mains can deliver adequate flow, would 12.7 give a reasonable shower (it would pass through a thermostatic mixer)?

Thanks
 
Sponsored Links
"Can do" is with a particular temperature rise. Check them.
the boilers will be flow-restricted to make sure you get water hot enough for a bath in winter.
28kW upwards is usually thought of as fine, though 24's are OK.
Electric showers are only 10kW or so, after all.
 
Size of gaspipe is also a point. If your existing would be fine for the smaller one, but the larger model will need upgrade, your bit of extra water will come at a high price. If pipe makes no difference, go for the bigger one
 
Sponsored Links
For the figures I've quoted, the spec sheet for the boilers say - "triangle" T (which I assumes means change in temp) = 35 K rise.

The flow rate at the factory set temperature rise ("traingle" T = 42 K) for the lower power boiler drops down to 10.6 L per minute. I guess this is the realistic figure once it's installed?

As for mains water flow, I got 17+ L/min at the boiler position (in the garage). The plumber is putting in a new gas pipe from the meter, so I anticipate that means there will be enough gas flow for the higher rated boiler.
 

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
Back
Top