Odd radiator measurements?

[Gorners]

Looking to replace 6 radiators in my house so just measuring them up and was expecting them to be all multiples of 100 both height and width (e.g 600mm x 700mm), but all the heights of mine are 520mm, 620mm or 720mm. Is this normal?

Also, do you measure the width to the valves rather than the radiator itself as these appear to be shorter.

 

[muggles]

Old rads are funny sizes, modern ones are in multiples of 100mm. You measure the width of the actual radiator, and may need to buy extension tails to make up the difference between the old and new rads.

 

[Gorners]

Old rads are funny sizes, modern ones are in multiples of 100mm. You measure the width of the actual radiator, and may need to buy extension tails to make up the difference between the old and new rads.

Thanks - house was built in 2000 and these are he original rads - would that be classed as ‘old’?

Fortunately (or unfortunately!) pipes are microbore so 5mm each side will be fine.

 

[Gorners]

Also could someone tell me what the difference between a liquid and wax sensor on a TRV?

Looking at these for my 10mm microbore:

Liquid:
https://www.screwfix.com/p/danfoss-ras-c-white-chrome-angled-angled-trv-10mm-x/33140

https://www.plumbnation.co.uk/site/...MIooWhparn3AIVzL_tCh1y1Qv4EAQYAiABEgIOl_D_BwE

Wax:
https://www.screwfix.com/p/terrier-3-white-chrome-angled-trv-10mm-x/1885v

Which one of these would you recommend and are there any better ones?

 

[muggles]

Danfoss RasC2 are far superior. Liquid sensors react much faster than wax ones

 

[Gorners]

Thanks, so you’d say the Danfos RasC2 over the Drayton TRV4? The latter looks better