So here's the thing, we all know how to plumb in a car rad, the hot hose at the top, the cold at the bottom so the hot water flows through
the radiator core and not by-passing it if say some numpty designed a car radiator with both the inlet and outlet on the bottom....
Well then why oh why when house radiators which have the same basic internal layout of passages, do people keep putting the inlet and outlet on the
bottom???? it's no wonder the bottom is like super hot and the top barely warm
what's going on? it looks totally stupid, like people just keep copying the same mistake without question....
[Edited on 3/9/18 by Mr Whippy]
I'm guessing it's a combination of ease of plumbing, and relying on the fact that heat rises.
Shouldn't be a massive issue though if the rads are properly bled.
The rads get hot at the top first, or should. If not it needs bleeding!
The system does work just fine. Probably not optimal, but they are cheap and effective, and you can normally plumb them top or bottom if you wish, but
not very attractive if top plumbed.
possibly a bit of both but really, it's still plain wrong
Reason I'm asking is I'm installing a solid fuel boiler, one of the requirements is that for safety there should be one rad and the water
tank heater coil not on the loop for the pump in case the power goes off. They should work by convection circulating the water, however they'll
be no real circulation from the rad if both the inlet and outlet are on the bottom, how does the water know which pipe to chose when they are both
the same temp and the only temp difference is the top of the radiator??
Hence I was (am) going to be plumbing it correctly regardless of the "normal way" however I can't think off any reason not to do all
the other ones the same way so water is flowing through the radiator and not trying to heat the carpet.
Not bothered about looks as I'm putting them in decorative radiator cabinets so the kids don't burn themselves
[Edited on 3/9/18 by Mr Whippy]
Unlike a car cooling system where heat is lost as quickly as possible, a domestic heating system has to exchange heat from multiple radiators to heat
an entire house more or less evenly whilst trying use as little energy as possible.
This is how a domestic renewables scientist explained to me why the in and out let are on the bottom
Hot water rises in the radiator when the water temperature in the radiator is equal or nearly equal the water can take the shortest route through the
radiator because its not raising and back into the heating system therefore reducing heat loss in the heating circuit water/liquid. This is one way to
increase the efficiency of the system only very marginally but it all helps.
Don't forget the flow side goes to the thermostatic valve if you are having them - the plumber that did my house got this wrong and it was ages
before I got the water hammer noises sorted.
Regards
Hugh
fitting the decorative rad covers will reduce radiator output by as much as 50%
from my experience
....as other have already said they are not designed wrong, they serve a completely different purpose to the type used in a car.
Agreed it makes no difference. We've got some fancy vertical dad's that are plumbed how you want to do yours and they are no better than the
standard layout of the rest.
The radiator covers whilst looking good are terrible for heating. Lose so much heat.
quote:
Originally posted by sdh2903
Agreed it makes no difference. We've got some fancy vertical dad's that are plumbed how you want to do yours and they are no better than the standard layout of the rest.
The radiator covers whilst looking good are terrible for heating. Lose so much heat.
TBOE is actually slightly more efficient the only problem is it doesnt look as tidy. Its normally seen more commonly in commercial building and schools
quote:
Originally posted by Mash
quote:
Originally posted by sdh2903
Agreed it makes no difference. We've got some fancy vertical dad's that are plumbed how you want to do yours and they are no better than the standard layout of the rest.
The radiator covers whilst looking good are terrible for heating. Lose so much heat.
My Dad's 94, and whilst he's not fancy, he does manage to be vertical at least half of the day
I'll get my coat
quote:
Originally posted by big-vee-twin
linky
Every rad I have ever fitted (OK, only about 60 over the years, I don't do it every day) gets hot at the top first, with the middle bottom bit
warming last. When the system fires up, put you hand against the rad and feel it.
Gravity should keep circulation going adequately....
quote:
Originally posted by cliftyhanger
Every rad I have ever fitted (OK, only about 60 over the years, I don't do it every day) gets hot at the top first, with the middle bottom bit warming last. When the system fires up, put your hand against the rad and feel it.
Gravity should keep circulation going adequately....
quote:
Originally posted by Mr Whippy
possibly a bit of both but really, it's still plain wrong
Reason I'm asking is I'm installing a solid fuel boiler, one of the requirements is that for safety there should be one rad and the water tank heater coil not on the loop for the pump in case the power goes off. They should work by convection circulating the water, however they'll be no real circulation from the rad if both the inlet and outlet are on the bottom, how does the water know which pipe to chose when they are both the same temp and the only temp difference is the top of the radiator??
[Edited on 3/9/18 by Mr Whippy]
^ yip this is how I shall do it, ta
quote:
Originally posted by 907
If you have hot water into the bottom and the outlet at the top the water will flow all the time because heat rises.
This is how your safety rad should be plumbed.
( From top of boiler to bottom of safety rad and back to bottom of boiler via the top of the rad. )
The remaining rads are plumbed in at the bottom and out at the bottom.
These then work with a pump.
Paul G
The none pumped thermo syphonic requirement you speak of is generated by the boiler not the rads.
The hot output from the boiler will be at the top, and the return at the bottom, as the boiler heats the water it rises and generates the circulation.
Pre combis, the bypass you describe was a must to prevent overheating in the boiler.
Paul G
quote:quote:
Mine aren't plumbed like that, presumably because the water loses heat as it goes through the rad, becomes more dense, then flows out the bottom back to the log burner.
So for mine : Top of boiler -> top of rads -> bottom of rads -> bottom of boiler.
Both of my rads are higher than the boiler.
interesting, to here some have been plumbed like that so not wrong, just depends on whether it is a pump or convection is the motive force for the water. So sounds like you could run you boiler with no pump.