leemkule

I think those figures are off. 22mm speedfit is the external diameter with an internal diameter more like 18mm and the 15mm has an internal diameter of approximately 12mm.

so I know how to work out the output but how do I work out the flow required for this rad and therefore see if my pipe diameter is adequate? I dont wanna go to the effort and cost of replacing the speedfit with copper if I dont need to

It's a 6 section deep column radiator which is why it's so high output, the depth is 230mm, height 500mm (600 with feet) and 966 width: https://www.homesupply.co.uk/Apollo-Roma-6-Column-Steel-Column-Radiator-With-Feet-600-x-996mm-WF6C5H1000 It has 21 sections, according to the spec sheets its 1.87 litres per section, so holds 39.27 litres of water apparently

Thanks for the reply. So both rooms have column radiators (bought before I knew of T22, T33 etc as I thought bigger rad = better) the biggest radiator on that branch of the system is 966mm x 600 mm (6 column, 21 section). Delta 50 output 1974 Watts, so I calculate at delta 15 (flow temp 35, room temp 20) it would output 415 w. How would I work out the differential pressure and output for this rad? I could give you the details of the others too if that helps.

Hi, Thanks for the comprehensive reply. 1. I have done the heat loss calculations for my house. The rooms on that 22mm branch (15mm down to rads) of hep2o in total require have a combined heat loss of 1456 watts and I have oversized my radiators appropriately for running a 35 degree flow temperature. 2. This is part that confuses me. If this branch only needs 1456watts, is my 22/15mm enough? I've seen the heat geeks pipe size chart which is helpful but it goes on to say 'First of all, these numbers are NOT for plastic pipes. The plastic pipe should absolutely NOT be used in a heating system, and particularly not on a heat pump, in our opinion, for many reasons which we will do a video on soon.' So how do I know if my pex is suffice and how come heat geeks are saying plastic should definitely not be used on a heat pump? They didn't go on to make that video as to why plastic is in their opinion not appropriate; however my only inference from their other videos is that the connectors and pipe inserts increase resistance. What's your thought on all this? That's interesting that your house is mostly piped using hep2o and that there's ways around if there is a too high of a pressure drop.

I have an old building that I'm gradually updating with the view to eventually having an ASHP or running my gas boiler at low flow temps. It's a 4 bed house and at some point someone has ran JG speedfit to supply the master bedroom (22mm main run and 15mm to rads), en suite and second bedroom radiators. The rest of the house is copper. I have been following heat geeks and urban plumber and the general consensus seems to be that PEX is a bad idea because the internal diameter is narrower and the fittings increase resistance to flow for a higher flow heating system like an ASHP. Ideally I would like to eventually have an 'open loop' system with rads upstairs and UFH downstairs all running at 35 degree flow temperature after we gradually upgrade insulation/radiators/windows etc. My question is, which is causing an argument in my house, should I upgrade the PEX to copper? My rather uneducated view is that if copper is superior for low temp heating flow rates I should upgrade the pipework to copper while the walls / floors are accessible and not plastered, my partner thinks it's a waste of time given that I don't fully understand the effect it will have on flow rates and also that we may never get end up getting an ASHP. What are peoples thoughts? Thanks!

This is probably a silly question, but please bare with me. If a 32mm basin waste maximum run is 1.7 meters, does that mean the entire pipe run from basin to larger waste pipe can be a maximum of 1.7 meters, or does it just mean a single part of the run can't exceed 1.7 meters, I'm sure it's the former but I'm just wanting to double check. If that's the case, can I use a coupler to go from 32mm > 50mm (50mm rather than 40 as I have spare pipe already) to allow a longer total length, obviously provided the fall is okay. Thanks for any advice.

Really? so all this talk of thixo etc on the more expensive stuff is just marketing?

I'm looking for recommendations on standard set s1 tile adhesives for my wet room install, using 30x60x8.5, bit overwhelmed by the choices. Had been considering kerakoll h40 gel or maybe ARDEX x77, any thoughts?

Hello, I’m in the middle of building an en-suite bathroom (project is actually much further along than the picture). The wall with the circle on it is part of the chimney stack. Before this project, there was a ‘hit and miss’ style vent over the rectangular hole in the chimney. The wall in question will be one of the walls of the new en-suite shower, which will be covered in tile backer board and then tanked. My obvious concern is that if I just block up this hole I will cause ventilation issues in the chimney stack. I had initially planned to put another hit and miss type vent in this location in the shower, but now that I think about it, I am concerned that humidity / water vapour from the shower may actually cause damp issues in the chimney since it’s in such close proximity to the shower, and that I would be compromising my shower wall tanking. The tubing you can see hanging down is a 4 inch inline fan for what that’s worth. We don’t have any plans to use the fireplace (one the other side of this wall and another downstairs) and may later remove the top of the chimney at the level of the roof. Currently we’ve put a ‘draught excluder’ made of wool in the chimney above the fireplace, obviously to stop draughts.Any advice would be greatly appreciated, cheers.

Just as an aside since you seem to know your stuff about tiles, would you go for R10 or R11 version for a wet room?

Thanks for you reply that's encouraging to hear from someone who has actually ordered from them.

ah, I only need around 40m2, do you think I'll have any options with roccia or are they strictly over 100m2?

I'm trying to source some specific tiles from Marazzi, but it seems most UK dealers are just re-sellers that rebrand tiles under their own name from Spanish / Italian manufacturers, so it's difficult to find the tiles I'm after. I found the Tile.Expert and can get the tiles I'm like, they have decent trustpilot reviews, but have my reservations about the website. Anyone got an experience ordering from them? It's a Maltese company that ships tiles directly from Italy where they have a warehouse, I ordered some samples and they came quickly. The price of the tiles is much cheaper than any UK stockists with similar tiles, even considering large shipping costs. Alternative, if you have bought Marazzi tiles before, where did you source them from? Thanks