SWMBO commented that the water coming out of the cold (direct mains) tap
was warmer than usual. And I tend to agree.

Without arsing around with thermometers and all that malarkey I wonder
how the recent heat may have raised temperature of water underground. If
at all.

I am aware that the fact the pipes must run in open air in the house
(Mondays temperature 29C) may have some effect.

However a very unscientific messing around with Chatbots suggests that
the 1,5C above SNT that I logged for all of June may equate to


Extra continuous radiative input: ~ 6.8 W/m²

Total extra energy in June 2025: ~ 17.6 MJ per square metre

This estimate assumes black-body emission into clear sky—it doesn’t
account for clouds, humidity, or circulation, but gives a solid first-
order approximation of the energy difference tied to a 1.5 °C anomaly.

Let me know if you'd like the same calculation applied to July or using humidity corrections!

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 03/07/2025 12:19, Jethro_uk wrote:

SWMBO commented that the water coming out of the cold (direct mains) tap
was warmer than usual. And I tend to agree.

Without arsing around with thermometers and all that malarkey I wonder
how the recent heat may have raised temperature of water underground. If
at all.

Possibly long pipe runs (miles) under tarmac roads.

I have an electric shower run directly off the rising main. This time of
year I have to reduce the heating input or it runs significantly hotter, indicating the the incoming water is at a higher temperature.



--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Thu, 03 Jul 2025 12:40:33 +0100, alan_m wrote:

On 03/07/2025 12:19, Jethro_uk wrote:

SWMBO commented that the water coming out of the cold (direct mains)
tap was warmer than usual. And I tend to agree.

Without arsing around with thermometers and all that malarkey I wonder
how the recent heat may have raised temperature of water underground.
If at all.

Possibly long pipe runs (miles) under tarmac roads.

I have an electric shower run directly off the rising main. This time of
year I have to reduce the heating input or it runs significantly hotter, indicating the the incoming water is at a higher temperature.

Yes, we have that every year. There is a long run (30+ft) from the main
to the shower through the loft, where it can reach 40C easily.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Jethro_uk <jethro_uk@hotmailbin.com> wrote:

SWMBO commented that the water coming out of the cold (direct mains) tap
was warmer than usual. And I tend to agree.

Without arsing around with thermometers and all that malarkey I wonder
how the recent heat may have raised temperature of water underground. If
at all.

I am aware that the fact the pipes must run in open air in the house
(Mondays temperature 29C) may have some effect.

However a very unscientific messing around with Chatbots suggests that
the 1,5C above SNT that I logged for all of June may equate to

Extra continuous radiative input: ~ 6.8 W/m²

Total extra energy in June 2025: ~ 17.6 MJ per square metre

This estimate assumes black-body emission into clear sky—it doesn’t account for clouds, humidity, or circulation, but gives a solid first-
order approximation of the energy difference tied to a 1.5 °C anomaly.

Let me know if you'd like the same calculation applied to July or using humidity corrections!

Conversely the opposite is the case in Winter, it takes the boiler a few seconds more to reach the set temperature in our shower.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 03/07/2025 16:33, Jethro_uk wrote:

On Thu, 03 Jul 2025 12:40:33 +0100, alan_m wrote:

On 03/07/2025 12:19, Jethro_uk wrote:

SWMBO commented that the water coming out of the cold (direct mains)
tap was warmer than usual. And I tend to agree.

Without arsing around with thermometers and all that malarkey I wonder
how the recent heat may have raised temperature of water underground.
If at all.

Possibly long pipe runs (miles) under tarmac roads.

I have an electric shower run directly off the rising main. This time of
year I have to reduce the heating input or it runs significantly hotter,
indicating the the incoming water is at a higher temperature.

Yes, we have that every year. There is a long run (30+ft) from the main
to the shower through the loft, where it can reach 40C easily.

In my case it's not necessarily static water in the pipe heating up in
the house. The shower can be used after the incoming water has been run downstairs for 5 minutes or more and the shower used for 5 minutes. The
water is still at the temperature where the shower heating is turned down.


--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Jethro_uk <jethro_uk@hotmailbin.com> wrote:

SWMBO commented that the water coming out of the cold (direct mains) tap
was warmer than usual. And I tend to agree.

Without arsing around with thermometers and all that malarkey I wonder how the recent heat may have raised temperature of water underground. If at
all.

I am aware that the fact the pipes must run in open air in the house
(Mondays temperature 29C) may have some effect.

However a very unscientific messing around with Chatbots suggests that the 1,5C above SNT that I logged for all of June may equate to

Extra continuous radiative input: ~ 6.8 W/m²

Total extra energy in June 2025: ~ 17.6 MJ per square metre

This estimate assumes black-body emission into clear sky—it doesn’t account for clouds, humidity, or circulation, but gives a solid first-
order approximation of the energy difference tied to a 1.5 °C anomaly.

Let me know if you'd like the same calculation applied to July or using humidity corrections!

When I did open water swimming there seemed to be a good correlation between river temperature and the cold tap temperature give or take a day or two.

--
braind

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)