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is there a Thermostat on the towel warmer?

putting a isolation valve on the cold will not reduce pressure, it will only reduce flow rate Most of these Bar type showers are designed to work on unequal pressures so you may have to stripit down to find any fault

Stelrad are the largest supplier of radiators

should not be a problem with this boiler

a powerflush would be a good start

definately sounds like the hot water temp sensor

To Install Oil fired Boilers you need OFTEC qualifications. Siting of the Boiler depends on dimensions , ie doors and windows. There are not that many oil boilers to compare as they all work on the same principle but i find Thermecon offer a great back up service

http://home.btconnect.com/centralheating/helpmate/Trades/Central_Heating_combination_Boiler.pdf

sorry but disagree. Safety valves are there for a reason and should not be regarded as a risk when checking there operation. i use this system on a regular basis and achieve results and i dont keep going back time and time again to the same problem. Dont be afraid of the Boiler!

is it a high limit or low limit stat?

chris pressure relief valves should always be tested as part of a boiler service Any one who doesnt test them isnt servicing properly! If a Plumber drains your boiler to work on the expansion vessel he would most probably drain through the pressure relief

i wouldnt worry about "maybe,s" unlikely that valve will stick open and lets face it do you wanna cure the problem or tiptoe around it! Pressure relief valves are not as vulnerable as people would like to think

http://www.mirashowers.com/onlinecatalog/pdf/p3278_4a.pdf

is the water pressure sufficient? These showers wont operate under low pressure conditions and also check the shower hose and spray head for blockages

when checking for leaks, do it when system is cold and increase pressure on system until water flows from pressure relief valve. The high pressur will make it easier to spot any leaks . Make sure you reduce pressure to normal before restarting boiler. Also Expansion vessel is a good start...

sorry to say but yes you may possibly have to cut panel to suit your bath. You may also have to install a framework behind panel to secure top edge and bottom plinth. i know it sounds daft but i have had to do plenty

if pipe is rippling when you bend it then you are either using the bender wrong ie dont hold the pipe when making a bend or its the bender itself Soldering is something that comes naturally to plumbers but the idea is to heat from the back of the fitting if possible and apply solder to the...

depending on the hardness of your water but 10years is a good life for any electric shower. Probably scaled up and would need replacing

I would lag any type of pipe for protection and yes 1" would prevent cracking through heat loss

The high limit stat is the overheat thermostat on the boiler. Is the boiler getting exceptionally hot ie if pump was faulty or not large enough then the heat would not distribute from the boiler and thus you would get knocking sounds until eventually the overheat stat would trip