Are column rads always OK fed at bottom?

[skyblob]

I have 3 new rads to fit in what will be a new system. These are 300mm wide, 1500 tall, vertical tubes, double. It's such a short distance across the 300 width, I can't help wondering if the hot water will all go up as it should, or some might shoot straight across to the return, and reduce the rad output.

Is it normal to always bottom feed, with even tall narrow rads like this

(Top feed would be possible, - I could hide microbore behind dot and dab, but it's untidy, and not so easy).

 

[muggles]

Have a look at the installation instructions, many of this kind have a widget in one end to encourage flow around the rad, so it's important which side you connect the flow and return on them if you go for a bottom connection both ends, but provided you get that right there shouldn't be a problem

 

[skyblob]

Thanks Muggles.
There is no widget, I just looked and can see clean through the holes, both ends the same. Nothing obvious inside. Perhaps I'll ask the supplier.
Rgds

 

[muggles]

Sometimes it doesn't come fitted, I've come across some before that look like a large screw with an allen key hole in one end that you have to screw in. As I said, check the instructions that were (or should have been) supplied with the rad, they'll give you the right answer. What is the make & model of the rad?

 

[skyblob]

Hi Muggles.
Its a Buildnet 2 section column rad http://www.buildnet.co.uk/Category/94-2-sections.aspx
Nothing much help on the website except a photo with both pipes at bottom. I'll give them a ring tomorrow. Teeny scrap of paper enclosed shows one pipe connected high, but judging by the rest of the sheet, I'm not sure what to make of that.
Rgds

 

[foxhole]

Heat rises , using bottom connection is fine.

 

[Agile]

Very oddly I have seen two coluum rads both about 1800mm tall which are connected at the TOP but they still work ON and get hot at the bottom.