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brightspark
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a t22 is better and puts out a lot more m,ore heat than the older ones. more radiating fins
Agreed, however a T22 projects too far for my liking. I'll get a pic in the day so you can get an idea of where it's being fitted and how much room I have to play with.
Anyway, how much difference would a modern unit make compared to something 40 years old?
Anyway, how much difference would a modern unit make compared to something 40 years old?
brightspark
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lots 
replaced most of mine put thermostatic valves on them all as well apart from one that has to be left open
replaced most of mine put thermostatic valves on them all as well apart from one that has to be left open
brightspark
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well go look up the specs for each radiator output . yourself dont be lazyI was hoping for a more quantifiable answer than 'lots'.
well go look up the specs for each radiator output . yourself dont be lazy
That's an answer to a completely different question. Without knowing what the output of the radiator i'm replacing is, how would I know how much difference it would make?
I'll repeat the question: How much difference would a modern unit make compared to something 40 years old?
I think you are being a bit silly in your responses, it is the type of question difficult to give a precise answer to with such little information.
Being uppity is not the best way of getting the best out of members, it's a community, members try their best.
A modern rad' of equal size will be more efficient but it isn't the complete answer.
If your intention is to replace the existing rad', how dirty internally is the rest of the CH system, when was it last flushed, chemically cleaned and inhibitor introduced?
All of those factors among others are important for getting the best out of any rad', out of any CH system.
For a bit of mind reading, not knowing the room size in question and with a little trepidation I think I can confidently say, those BTU figures you quote are not correct.
A 40 year old rad', am I correct in thinking the rest of the system is or not far behind in age and is a Back Boiler involved?
If so, do any of your rads' have TRVs fitted, indeed do you have a room stat' installed?
Of course you don't need any of the above to replace a radiator but if you have sludge in the system you will push it into any new rad', there is your "difference" your efficiency gone.
A few pics of the original rad, and the one being contemplated as a replacement, would help. A thermal camera image of the existing radiator, after the heating has been in operation for at least half an hour, would also be useful.
The heat output of a radiator, for a given water temperature and flow, is going to be determined by the combined surface area of the two panels, including any surface area gained from the dimpling or patterning of the surfaces, and by the amount of finning in between, and how well the finning is bonded to the panels, minus an amount corresponding to the inefficiency of the radiator, due to sludge, and by a further amount that is determined by the water flow.
The heat output of a radiator, for a given water temperature and flow, is going to be determined by the combined surface area of the two panels, including any surface area gained from the dimpling or patterning of the surfaces, and by the amount of finning in between, and how well the finning is bonded to the panels, minus an amount corresponding to the inefficiency of the radiator, due to sludge, and by a further amount that is determined by the water flow.
dobbslc
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How would anyone else know the difference then?
The BTU output in your case will be limited by the width of the pipe centres and if a twin panel rad is too big you're then limited to what you can buy.
If it's a 40 year old radiator you are replacing anything will probably be 'lots' better!
addjunkie
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I would power flush the existing system, it does make quite a difference. And then being a belt and braces kind of person, replace all the radiators on the system with New modern with TRVs. Made a huge difference in our last house.
gaz1
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from the old 40 year old rads to the new t22 rads you will gain twice the heat output from the rad into the room
if you buy the same size rad
as goes for btu from the boiler it should be to a double rad no fins system so that btu is the rated output from your rad add fins to it you gain more btu into the room due to the mass being heated
you are only putting in the same amount of water into a rad that had no fins whilst the newer ones have fins designed to take more heat away from the radiator therefore warming your room up faster the further adding of the boxing adds more heat faster
the only difference is the radiator cools down faster as its transfering more heat into the surrounding air within the room
if you buy the same size rad
as goes for btu from the boiler it should be to a double rad no fins system so that btu is the rated output from your rad add fins to it you gain more btu into the room due to the mass being heated
you are only putting in the same amount of water into a rad that had no fins whilst the newer ones have fins designed to take more heat away from the radiator therefore warming your room up faster the further adding of the boxing adds more heat faster
the only difference is the radiator cools down faster as its transfering more heat into the surrounding air within the room
When you find the 5000btu size rad comes out larger than the existing one you'll know which figure is right.
Fitting the largest may rob heat from the next rooms rad or if the boiler is too small for the extra 3000btu the whole house bar that room will be cooler so the boiler will run longer.
If you switch an old 2000btu rad for a new 2000btw the heat difference is plain to see, ZERO. The difference will be the new rad is smaller.
gaz1
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ignore the btu as the new numbers reduce the size of radiator
replace the existing rad with the same size rad
so if you have a double rad then fit the same back in, its your choice on if you choose single fined or double fined or enclosed i always opt for enclosed
the only difference is the room will heat up faster with fined compared to the older type panel radiators for the same amount of water pumped into the radiator from the boiler
whilst the older type rads held the heat longer than the newer fined type models
the older type cast iron radiators hold the heat for much longer for the same amount of water pumped into them
