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Update: Took out half the kitchen. Fitted new pipes from the boiler at a lovely angle of around 10 degrees, then a vertical run straight up through the bathroom and into the loft... Tested, worked! Refitted cabinets, oven, fridge freezer and washing machine. I even replaced the vinyl floor as I...

Yes, there was, but not a massive amount. Probably only 5cm over 2.8m. Thanks for your help everyone... Time to go buy a bit more pipe, take out the kitchen units, cooker, fridge freezer... All for a separate shower. Next time the wife asks for a new bathroom, I might just move house. Iain

I'll give that a go!

To top it all off, now my heating pump is running constantly. Could my hot water issue be the boiler? Is there two separate parts on this boiler? Is the heat in the hot water pipes just conducted heat from the heating system?

Ianmcd: I assumed this wouldn't have an affect as there's separate flow and returns for hot water and heating from the boiler. The original 'outside' drain down point was located under the dining room floor, now not easily accessible due to laminate floor. So I put a new one in a while back off...

No slope in the horizontal under the bathroom floor. :( A rethink might be in order. I could drop the pipes all the way down into the kitchen below and get a better slope behind the kitchen units. Thanks so far everyone.

So as there's no air in the system, have narrowed it down to flow of hot water to the cylinder? Anything else I can try?

There's not much I can do about the elbows. I can alter the pipework a bit more to help the slope, but as you can see, access is tight. It would be a royal pain.

Rules & Rulers: About 2.8m, but exactly the same length as before, just in a different place.

Okay... Just bled the new high point. No air at all there in either flow or return.

Picasso... If it's as simple as adding another pump then I might just go that way. Photos as promised from both sides of the wall. The original pipework went straight through the wall above the RSJs and then followed the bathroom walls. I've dropped them to go through the RSJs and under the...

Haha. Just my luck... I've bled the high point of my alterations, but this was before pushing water through the vent, so I'll try bleeding again after I put in a air vent. Cheers all, I'll let you know how it goes.

Immersion works as a back up, but it's not something I want to rely on.

Getting somewhere... Thank you Tony. My alterations may have affected things then. To avoid running the pipes along the wall, I've dropped them under the floor into notches (already there). The pipes run from a void above a kitchen extension into the bathroom and I had to drop them 4" to go...

Thanks for the quick replies... Photos to follow soon. Agile: Alterations were a simple re route in the bathroom to avoid running along a wall. Length is the same. I've loosened both flow and return to cylinder to see if an airlock was there. Happy to try again. Sajeel: Sorry, should have...

Hi all... Suggestions please. After recently making alterations to the 28mm flow and return from the boiler to cylinder I now have no hot water. Heating is fine. Pipes are hot from the flow and warm from the return up to the first floor, but not much above that. I've checked for airlocks and...