pipe layout advice

[d4nnyboy]

A pre-emptive thanks for anyone who helps.

I recently fitted two new rads in the bedrooms and I was that impressed with the heat they gave out compared to the old ones that I want to fit a new rad in the front room, the old one in the front room gets hot but doesn't actually heat the room that well, might have something to do with it not being beneath the window.

So what I want to do is fit a new rad under the window in the living room.
Here is a plan of the pipes as they are now:

All the rads in the house are on 10mm microbore but no manifolds were fitted, just reducers from 22mm, to 15mm then 10mm.

Here are a couple options:

I'm not sure about option1 because of 3 rads connected to the same microbore might not get enough pressure? i'm only giving an educated guess, I'm not a plumber but a competent DIY'er.

Option2 shows me adding a 15mm feed to downstairs and have the front room rad on 15mm pipe..would that be ok?

I'm opting for option2 but I would apprieciate some professional input...or even an option3?

Any advice will be very much welcome

 

[dontknowitall]

Pipework seems fine without altering. If the rad gets hot but doesn't heat the room well, then it's probably undersized for the room. (Imagine just having a pipe - get's hot but not much good for heating a room!)

 

[stevetheplumber]

option two will be fine and the extra rad should make all the difference

 

[d4nnyboy]

Option2 it is, moving it under the window means i can put the couch fully against the wall too!

Thanks very much for the input.