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Hi I have been making a 15mm offset using a hand bender - I pulled it to 45 degrees and the distance between the two fittings was 65mm. so i marked 2 lines on paper 65mm apart. i made the first bend and layed it on the template (on the paper) and marked the position for the second line. I...

as new ly installed boilers now have to have a SEDBUK rating A or B - and these are condensing type boilers: does it mean that if replacing a boiler (eg my potterton flamingo-i have to get a condensing type? and these condensing type boilers are system boilers that have the pump, etc built in...

is it true that when changing a siphon, if you don't tighten the siphon nut tight enough (ie with water pumps) then when the cistern is replaced water will leak out of the back of the pan where the cistern sits?!!!

sorry but i need to clear something up for piece of mind!! an immersion heater has its own radial circuit from the cinsumer unit, usually rated at 16amps (mcb) - twin and earth runs from this to a double pole-switched socket near the heater? correct? in my socket i have a cartridge fuse...

i need someone to clear something up for me please!! a RECTIFIER transforms AC to DC doesn't it?? DOES a diodie do the same thing??

thinking about getting a chrome towel rail rad for the bathroom-and doing the pipework change/fitting the valves, etc myself. just one thing though-how do i find out the kw rating of my old rad!! as i don't want to get a new one with less rating! any hints??!

a quick question - why is the motorized valve (2-port) on the Return between the cylinder and boiler on a c-plan system (gravity hot water) - why can't it be on the flow? Does it make a difference? Was reading about it and it didn't state why! WOuld be interesting to know if anyone knows why?

just a quick question-a 3kw immersion heater at 240 volts will use 12.5 amps - so will a 13amp fuse be sufficient in the spur socket? i read that a 15amp fuse or 16 amp mcb should be used so i'm not so sure now!!???

near my consumer unit and the board which the supply head/meter is attached to (what's the name for this called again as I cannot remember)!! there is a RCD on the wall, which has 3 leads going into it (L N and Earth I suppose from the colours, red black and green/yellow)! a lead (with all 3...

Hi I have some baaic electrical questions that I need some help on please if possible?! What is the difference between a MCB and a RCD? I know a MCB is like a fuse and trips a circuit if the current gets overloaded, but what exactly s and does a RCD do?!!! Sorry if I sound ignorant...

if all TRV's are turned off on all rads in a house, will this automatically turn off the central heating? or will the central heating only turn off when the programmer /room stat tells it to do so?

are there are links anyone could offer me to webpages that show details about how boilers work/the integral parts/why things go wrong, etc? I really want to learn about boilers, especially gas boilers, but don't really know where to start! i'm not going to start playing with my boiler, lol! i...

please forgive me if i sound dumb with this question!!: but is twin and earth wire, just a name for live, neutral and earth all in 1 3-core wire??!!

just a brief question about central heating wires: i know a motorized valve uses a 5-core wire. and an immersion heater uses a 2.5mm2 heat resistant flex. but what wires and used for cylinder stats, room stats, pumps, etc? just normal 3 core? any specific size or features?

Just a quick question in general about cylinder stats. With the S PLAN wiring the Cylinder stat only has 2 terminals but on the Y PLAN it has 3 terminals. I know these basically open and close a switch which then either opens or closes the motorized valve. What I am saying is, do you need a...

i've posted a few misunderstood messages these past few days about the electrical witrings in my airing cupboard!! Anyway I now know what I have and would like to ask for some advice if possible? I have a Y PLAN: GRUNDFOS PUMP 3-PORT VALVE CYLINDER STAT ROOM STAT PROGRAMMER I know...

should a central heating/hot water porgrammer have 2 elctrical cables from it?? One going to the terminal box to join the other wires from the pump, stst, etc, but what's the other one for??!!

does the programmer and boiler have separate electric cables? i ask because i am trying to learn and understand my system! I know the terminal box in the airing cupbaord connects all the components up together in a specific way, ie y-plan system with 3-port mid pos valve, pump, etc. but the...

i have a question: Y PLAN FULLY PUMPED system with 3-port mid position valve is wired up in a standard way i believe? BUT on diagrams the terminal box strips are numbered from 1-8! Does it matter what boxes are used, for eg on my diagram the orange wire from the mid position valve is...

quick question: if replacing a cylinder stat, a danfoss for a honeywell, for eg, do the wires in the terminal box go in the same holes, like for like?