Matt, you just made that up.
It is clear you did make that up. "Most" flow through rad goes right across the bottom. The hotter water makes the water rise to the top. This, when there is little water injection to the rad will form mixing in the rad.
Sad but true.
On Tue, 4 Jul 2006 18:41:01 +0100, Doctor Drivel wrote (in article ):
Only of the flow rate is fast.
Don't be silly. If the flow rate is low, then the water will convect upwards over the first few channels in the radiator and heat the top.
If you don't believe me, go and try it with a TRV almost closed or a lockshield turned right down.
Looking over the boiler choice FAQ should give yoiu some help.
-- Ed Sirett - Property maintainer and registered gas fitter. The FAQ for uk.diy is at
Topically, game set and match to Andy.
No lad, he's right. Put gob in neutral and engage brain and you might learn something from him.
The TRV controls the flow rate, not the temperature. Although the average temperature of the radiator is reduced, but the hottest flow water entering convects to the top, which is nearly at the flow temperature.
It is critical in sheltered housing where high surface/water temperatures can be very hazardous. I was once asked about this and advised that low surface temperature (LST) radiators were the only fix. A cheap fix was offered by a "heating engineer" who also thought TRVs would solve the problem. A contact thermometer later showed him to be mistaken; unfortunately the contact thermometer was wielded by a health authority representative (or whoever inspects these places), who then determined the premises weren't yet fit for patients they were responsible for.
Both of you are WRONG!!!
Gosh.
And cools very quickly when mixing with the cooler water in the rad. The whole rad is not at the boiler flow temp.
When the flow is high through the TRV the rad will be a higher temp, when low a lower temp. Got it? So you have a sort of compensator effect which lowers and raises the temp of the rads. Where old people and children are concerned LST rads are the only answer as they will "never" be hot to the touch.
Read what I write and learn.
How are your loafers? Pity, always comes in with dog shit on his shoes.
Give it a miss. That is a joke. Or have you added the bits I mentioned to get it up to date?
On Tue, 4 Jul 2006 23:19:49 +0100, Doctor Drivel wrote (in article ):
Nope. It is you who is out of touch with reality.
Obviously not, and that was not what was suggested. However, the hot flow water will convect to the top of the radiator with minimal mixing.
Fudge and waffle. Have you fooled yourself?
It might be better if you researched what you intend to write before doing so. That way you could pretend to be knowledgable sometimes.
Matt, you know you haven't clue about heating.
Matt, use an IR temp recorder on a the flow pipe and the top of the rad.
On Tue, 4 Jul 2006 23:59:53 +0100, Doctor Drivel wrote (in article ):
No need, but you can if you like.
You have to Matt, as you haven't a clue.
On Wed, 5 Jul 2006 09:55:23 +0100, Doctor Drivel wrote (in article ):
Tell you what, mr. Smartass....
Why don't you go and do the measurements and post them.....
Measure points 100mm apart horizontally at top, centre and bottom of radiator.
Matt, you can't tell me anything at all.
On Wed, 5 Jul 2006 13:57:05 +0100, Doctor Drivel wrote (in article ):
Think about one thing. When you are perfect and can know no more there is only one direction that you can go.
However, I am not suggesting that this would ever be a problem that you would encounter.
Matt, then I just stay still then.
You will achieve worthwhile savings with a
Aidan, thank you for your useful response. It is beginning to look as though I could benefit from fitting a good modulating boiler: I do not have space for a heatstore.
Anode.
Make sure the modulation is load compensation control not modulation of flow setpoint. Matts, Boiler the MAN, ECO-Hometec in the UK, is excellent indeed and this you will not be disappointed in. Not cheap, but the best is not cheap.
BTW, a thermal store is not the same size as most cylinders.
Your points noted. Thanks.
Anode.
Should be, "BTW, a thermal store is the same size as most cylinders.
If you do for a new boiler then uprate the cylinder to a "quick recovery" cylinder. This will give hot water very quickly and enhance condensing efficiency. There gain if you are going for a new cylinder you may as well go thermal store.
Best to cost the two:
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