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bamber i am more enlightened by the minute

it is 15mm on tank return to i presume 22mm on the rad return under the floor. at present there is a gate valve in this pipe. this was fitted by a plumber a few years ago when the system clogged up due i think to the builders having put no additive into the new system. do you think i should...

thanks gas4u. why does it matter which side of the gatevalve i fit the auto valve? surely the balencing gate valve will remain partly open the same as present, and will be overridden by an auto valve possibly operating

gas4u thanks for a sensible reply i will put one in anyway. in your opinion do you think its enough to connect to the 15mm on tank return. ait definately has no pump overrun, and i will check the boiler model before i do anything

bamber why will it just keep circulating round. isnt that the idea of the auto valve to prevent that

yes why not happy through 15mm it is happy enough when its on hot water only mode

gatevalve is already there in place and open half a turn as you say. are you saying if there is a gatevalve i do not need a auto bypass valve

Bypass was not installed as original. maybe because thermo valves were not either

Not the beano. most valves i see have 22mm pipe connection as standard

think its a classic. open vent system gas. 11 rads balanced flu

Ideal wall hung balanced flu, very popular black glass front version of older model, cannot remember model. is it house i rent out. poss 60k btu

Hands up all who would run it into the 15mm or do it the hard way and pull up the floor?

But can i run the bypass into the 15mm pipe that is showing above floor, or do i have to pull up the floor to get to the 22mm rad return? Is it good enough to go into the 15mm pipe given that when the system is on HW only this is all it is going through anyway.

I am soon to modernise an S plan heating system. I plan to add thermostatic valves to most radiaters, excepting those in lounge that are controlled by the room stat. I assume i will also need to put in a auto bypass valve. Immediately after the pump is the T where the CH and HW pipes part...