Hi
I'm about to install a grohe wireless shower pumped version. It's a gravity system, base unit to be fitted next to the hot cylinder in cupboard behind shower.
My question, can I run 15mm from the loft cold tank into the base unit or do I need to run most of it in 22mm, likewise 15 or22m for hot supply. Also Grohe have said there's no need to use a surrey flange, I can simply take the hot supply before it tees off any where else. Is this correct since I thought pumps needed a flange to stop air.
I'm no plumber but want to get it right first time.
I'm about to install a grohe wireless shower pumped version. It's a gravity system, base unit to be fitted next to the hot cylinder in cupboard behind shower.
My question, can I run 15mm from the loft cold tank into the base unit or do I need to run most of it in 22mm, likewise 15 or22m for hot supply. Also Grohe have said there's no need to use a surrey flange, I can simply take the hot supply before it tees off any where else. Is this correct since I thought pumps needed a flange to stop air.
I'm no plumber but want to get it right first time.