Thinking about a 10mm hot tap feed

[Neil Ives]

Hi. My boiler is about 20 feet away from the kitchen taps. The water to the sink hot tap takes quite a long time to get really hot. The current feed to all taps in the house is 15mm pipe; I'm thinking of running a length of 10mm pipe from the boiler to the kitchen hot tap so that less volume of water has to be shifted through the pipe. The dishwasher, and all other taps would stay on the 15mm feed. What are your thoughts on this idea?

 

[oz-plumber]

Sounds feasible.

You don't know the existing run of the hot water pipe do you?

It may be a lot longer then the 20 feet you estimated.

 

[Last Plumber]

What Type of Hot water system is this?
Combi?
Open vented or unvented Cylinder?
Multipoint?

Excuse my asking but people do call all sorts of things 'Boilers'.

 

[Neil Ives]

Sounds feasible.

You don't know the existing run of the hot water pipe do you?

It may be a lot longer then the 20 feet you estimated.

I know the run intimately as I installed it

Anyway, what about my idea? Would the narrow pipe cause an unacceptable resistance to the flow?

 

[Neil Ives]

What Type of Hot water system is this?
Combi?
Open vented or unvented Cylinder?
Multipoint?

Excuse my asking but people do call all sorts of things 'Boilers'.

The boiler is a Veissmann Vitodens W-100 Combi. No hot water cylinder.

 

[ShaunCorbs]

Should be fine

 

[townfanjon]

Yep I have done it with no probs

 

[Last Plumber]

It should be ok.
Only thing I can think is it may be slightly noisy
( possibly)

I would find out why it takes so long first though.

Some taps appear to have a powerful delivery but when measured they can be quite low ( litres per min).

 

[robj20]

This is what im thinking of doing. Boiler is in the garage and the kitchen is at the furthest point away, luckily to get to the bathroom it goes through the wall and up into the bathroom.

I was hoping to use 10mm for the kitchen run to reduce the amount of time it takes, after all flow isnt as important to fill a sink.

 

[Neil Ives]

Ok folks, what about going one step further and using 8mm pipe? Good idea, bad idea?