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hours
An hour (symbol: h; also abbreviated hr) is a unit of time conventionally reckoned as 1⁄24 of a day and scientifically reckoned as 3,599–3,601 seconds, depending on conditions. There are 60 minutes in an hour, and 24 hours in a day.
The hour was initially established in the ancient Near East as a variable measure of 1⁄12 of the night or daytime. Such seasonal, temporal, or unequal hours varied by season and latitude.
Equal or equinoctial hours were taken as 1⁄24 of the day as measured from noon to noon; the minor seasonal variations of this unit were eventually smoothed by making it 1⁄24 of the mean solar day. Since this unit was not constant due to long term variations in the Earth's rotation, the hour was finally separated from the Earth's rotation and defined in terms of the atomic or physical second.
In the modern metric system, hours are an accepted unit of time defined as 3,600 atomic seconds. However, on rare occasions an hour may incorporate a positive or negative leap second, making it last 3,599 or 3,601 seconds, in order to keep it within 0.9 seconds of UT1, which is based on measurements of the mean solar day.
Hi all
newbie so please be gentle,
ok so I'm having to change job due to developing diabetes, (HGV driver)
I have always had an interest in working as a plumbing/gas engineer but never had the motivation to follow it through, now it would seem i have had the kick in the backside I needed...
Hi all,
I have wet UFH 4 Zones. I used to have HIVE controlling it but I wanted a better way of controlling Zones as I was wasting money having all 4 zones at the same temp.
I have since dumped HIVE and have had emmeti actuators, Wiring centre and RF thermostats fitted.
My problem is that it...
Hi all, I have just registered with this site...I am mainly a kitchen/bathroom installer but carry out most home renovations and have been doing so for the last 20 odd years. I am located in north London and am thinking of focussing on a call out emergency service aimed at north London. I...
Hi, I'm hoping for some advice to point our landlord in the right direction for getting us a heating fix.
In the past month, our rads have started to go stone cold two hours after they come in.
The cylinder stays really hot, and the boiler is still on, but it's like the rads are switching...
Jill
Thread
after
boiler
cold
hot
hot water
hours
problem
radiator
radiators
running
water
Hi all,
Wonder if somebody can provide me with some advice on a CenterStore 120 unvented hot water tank.
The unit has two power inlets - 1 on the ECO7 and 1 for the booster. The main source to heat up the water is via ECO7 which switches on about 2200 and will heat up the water over night...
polly_31
Thread
dripping
hot
hot water
hours
overflow
tank
unvented
water
water tank
Hi
Any advice on this tank. It has no timer also.
How many hows should i leave it on for do you think? Or is it a case of trail and error?
Any other advise tips are hugely appreciated
Thanks
KellyC1
Thread
about
attach
hot
hot water
hours
should
tank
timer
water
water tank
Hi,
Our plumber has just invoiced me for the following:
Fitting 3 radiators - 14hours
Fitting boiler plus flue - 15hours
I'm concerned that he is trying to rip us off because know for a fact that he did the boiler in 1 day. He started in the morning as I left for work and was done by the...
Swearing is allowed in this forum,just nothing else
Got broken into last night,some utter low life smack head ******* broke into my home and put my family at risk,but Super dog,Rover,the ageing,totally psychopathic parsons jrt was having none of it,chased the ****** and bit him,my mrs came...
I have a customer who lives in an old cottage. It was originally two cottages now knocked into one.
She has two combi boilers both 24kw running off a 4 pack of 47kg.
The installation is sound no leaks. Basically she is runnng her heating on both boilers for roughly 4 hours a day and hot water on...
Hi.
I'm having problems with finding the reason for that pressure to keep falling to 0. The customer rang me saying it took 4 hours for it to drop but I'd image he had it on all that time. When I went out I checked the pressure relief valve, drained the boiler and recharged the expansion...
For years I have always just hit the 1hr boost button to turn on my heating. I maybe hit it once in the evening and let it run and hour, let it go off an hour then hit the boost button again for another hour.
Now my father in law says its more economical to just let it run for the solid 3...
1manonthebog
Thread
boiler
central heating system
hours
letting
oil
starting
Hi all.
As a paid up member of the "bah humbug" club, I am embarrassed to be posting this so early, but apparently there is a traditional holiday called "Christmas" later this month?
It seems that as a consequence of this sentimental nonsense we have to take a temporary break from picking your...
Hi gents.
I'm currently studying my level 3 NVQ and I'm working for a one man band. In work I do a lot of the work and on a average day it's 9 hours but this does go on sometimes in to silly hours. Ive just passed my OFTEC which the boss paid for so I don't want to leave if I can help it and...
Hi I'm new on here and I am looking for some help,
I'm half way through my first year of a 2 year city and guilds level 3 diploma in domestic gas, I need to gain 250 hours work experience by the end of July 2016, and have a placement lined up by Sept this year. Is there anyone out there gas...
Hi Forum, Thanks in advance to any advice offered. I've been battling with a new close coupled toilet I've recently installed. The toilet came with badly translated instructions but I finally figured them out and got it all put together. It's one of these toilets where the plastic fixing bolts...
allanwhyte77
Thread
about
can't
cistern
hours
pan
toilet
trickle
water
Sentinal x800
Is their any maximum timescale this stuff should be left in a system?
I have always ran it up for few hours then drained .
can you leave it in for several days or is it to acidic?
Help please !
My central heating system is very basic and consists of a boiler, circulating pump, basic timer/programmer and piped installation. The circulating pump is on its last legs and I intend replacing it.
Details on the existing pump are:-
Two Speed Grundfos Super 4
No -...
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