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Sorry if I'm being misleading here:- When I mention gravity fed I am referring to the domestic hot water ie. high level cold water storage tank, indirect cylinder and all outlets below it - hence gravity fed as opposed to unvented, mains fed. The primary pipework will be pumped, using the pump...

Thanks Kev, my reference to gravity fed relates to the secondary side, I'm planning on using the pumped radiator circuit for the primary coil. I will just turn off the radiators, except the bathroom one in the summer.

With a recent house move we have inherited a, recently installed, Worcester 24cdi combi. This seems to have been properly installed (Benchmark etc.) with the possible exception of the flue, more of which in a bit. We are planning some fairly significant changes to the house, part of which...

Well, if the pipes out of the boiler are not getting hot, the boiler isn't firing. Even if the pump is stopped the boiler may fire until high temperature lockout caused by low flow. Early on in this thread there was a mention of gurgling air/water noise followed by the rads warming up...

Are you SURE that the pump is running rather than just making a noise and vibrating?

SparkyT : compression fittings on steel? Pipe freezing is ok, but must be really well planned - have watched 6" high temperature (150 deg.C) district heting mains frozen - it did take a tanker full of liquid nitrogen and several hours but it can be done. I haven't tried the kits but I...

Not always - Johnson brothers used to do a side entry cistern, possibly still do - someone will.

To find out if it is a valve problem - prepare for a bit of a mess, and I would suggest you do this with system fairly cool. Turn off both radiator valves, open the air vent, then open each valve in turn. You should get an idea of the flow rate through each valve from the amount of water coming...

....or a tub-and-bucket......And the little tank in the attic is the heating feed & expansion tank.

I had a long (mind numbingly long) discussion with a rep from Wednesbury Tube (I think) several years ago and found the metalurgy hour quite interesting - and Open University TV programmes recorded by mistake.

ChrisR - Yes, thanks for that: the reason that commercially produced tube is quenched as opposed to being left to cool is that 'lengths' are stored in bundles and 'coils' are, well, coiled. So from the heat treatment plant the the stock would cool quickly on the ends of the lengths and the...

Half-hard temper in yellow metals – brass copper etc. refers to the heat treatment during manufacture – in the case of copper tube the extruded tube is cooled then heated then cooled rapidly (annealing) to produce a finished product that is relatively tough but malleable enough to be bent using...

Can you turn the pump speed down? If not, try giving the pump some additional resistance by partially closing one of the pump IV's - I'm not suggesting this as a permanant solution but it could identify if your pump is generating excess head. I know that your cold feed and vent connection...

Many years ago I lived in one of these and suffered with a shower the previous occupant had installed. It was awful, the original tiles that had been glued to the plywood walls with pva fell off as the wind blew. I replaced these with mosaic type tiles on mesh, success in that department. Leaks...

As Kev says the replacement valves for large connections on rdiators are expensive but are available up to 1 1/2" BSP. The mixture of galvanised steel pipe, chemical treated steel (panel rads), cast iron (cast sectional rads), copper pipework, gunmetal, brass fittings, all sorts of...

Croydon, can you, or do you monitor when your boiler actually operates in condensing mode? This is just out of curiousity. Apologies to Fronnie for hijacking the thread. I seem to do that quite a lot. Oops.

Sorry Shaggy, I wasn't taking the p*ss. The Consultation document issued by Mr. Prestcott's office states that "In some specific boiler replacement situations it is acceptable to install a non-condensing boiler. It goes on to say that "about 20% of the replacement boiler market will continue...

Shaggy - People with existing systems will not be required to change their boilers. There are plenty of existing boilers that can be kept running for many years without much effort. Unfortunately there are also plenty of service engineers, plumbers and well meaning forum contributors who will...

DP, I don't see how condensing can take place if a system flow temperature is at 85 deg. The return temperature will be entirely dependant on the heat given up by the radiators, heat transfer to the domestic hot water (if the boiler isn't a combi.) and heat loss from pipework. Now, unless...

Convention for heating systems that don't include a condensing boiler is 82 deg. flow, 71 deg. return. Although, in order to keep pipe sizes down people often design on 80/60 (makes the radiators a bit bigger though). Just by way of explanation, the 82 deg comes from a BS requirement to...