Over 3 mins to get hot water in kitchen - is this normal?

[gastec]

What size is the incoming water mains?

 

[LCV]

Hi Shaun - test done at 3:40pm. Time taken to get hot water is 2mins 40 seconds. 10.8 litres.
Does the time of day make a difference? Also, I had to stop and start as I only have one empty 2L plastic bottle, i.e. once the bottle was full I turned off the tap, emptied the bottle and refilled. Do not know if this affects the results in anyway.

 

[LCV]

Hi Gastec - sorry I don't know and I wouldn't be sure of which pipe to measure.

The house is 11 years old. Your question has made me think whether the location of the water mains could be causing the time lag. I think my mains water pipe is at the front of the house. The Utility room where the boiler and cylinder is located is at the back of the house.

 

[Riley]

Hi Shaun - test done at 3:40pm. Time taken to get hot water is 2mins 40 seconds. 10.8 litres.
Does the time of day make a difference? Also, I had to stop and start as I only have one empty 2L plastic bottle, i.e. once the bottle was full I turned off the tap, emptied the bottle and refilled. Do not know if this affects the results in anyway.

those results sound ridiculous that's under 5 L a minute. My naff gravity hot water at home will do 10 L a minute easily. It sounds to me like you have a bigger problem there Also stopping in between each 2 L is going to make a mess of the results. maybe get a couple of 5 L buckets from the hardware store

 

[Riley]

Hi Gastec - sorry I don't know and I wouldn't be sure of which pipe to measure.

The house is 11 years old. Your question has made me think whether the location of the water mains could be causing the time lag. I think my mains water pipe is at the front of the house. The Utility room where the boiler and cylinder is located is at the back of the house.

Why do you think it's causing an issue ?? Were you given the option to upgrade your mains if necessary The correct operation of an unvented cylinder is very dependent on the flow and pressure of water. Do you know where your stopcock is if so take a photo of it to include the pipe entering and exiting it

 

[LCV]

if my math is right a bristan kitchen/ any tap has a flow rate of about 10-15 lpm (estimated)

so take it at 10 and you dont have hot water for about 3 mins

thats 30L does that sound about right (ballpark)

Just rereading this comment. Wow, 30L, that is a lot. I thought filling over five 2L bottles before I got hot water was bad but okay my situation is not as bad as this. When I wash up I don't turn on the tap at full blast otherwise the water would spray everywhere. Generally I turn on the tap, wait for the water to become hot and when it is hot I increase the flow. In the test I had it a bit higher than medium flow.

 

[ShaunCorbs]

those results sound ridiculous that's under 5 L a minute. My naff gravity hot water at home will do 10 L a minute easily. It sounds to me like you have a bigger problem there Also stopping in between each 2 L is going to make a mess of the results. maybe get a couple of 5 L buckets from the hardware store

Won't harm that much tbh will give you a rough Idea
And agree somewhere there is a problem, maybe a half closed valve or rubbish in a strainer etc

Would need a G3 eng to check those tbh

 

[rpm]

Oh okay. I understand. It is difficult to make a real assessment without all the relevant information.

More like impossible I`d say !

 

[LCV]

those results sound ridiculous that's under 5 L a minute. My naff gravity hot water at home will do 10 L a minute easily. It sounds to me like you have a bigger problem there Also stopping in between each 2 L is going to make a mess of the results. maybe get a couple of 5 L buckets from the hardware store

Hi Riley - I see, shall I redo the test but turn on the water at full blast? I need to get the bucket first.

 

[Riley]

I think the simple answer here is LCV needs to get another engineer in to take a look there is a number of things here that don't add up and over the Internet it's Nigh on impossible for us to work out with a massive degree of accuracy