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How do I know if an existing Indirect HW Cylinder is heated up through the coil by gravity or a pump?

Daft I know, but try turning on working tap then opening capped end may help if air lock.

I'm going to be teeing off a radiator otherside of the extension, not sure where the stiltsons come into it

Sounds like could be a faulty stopcock, try seeing if you have any water at house end of stopcock as opposed to tap end. You'll then be able to narrrow done the problem. If you've got no water this side of the stop cock then you knwo the problem is between the house and the stop cock, if you...

I'm thinking of running some heating pipes in my extension in 15mm Speedfit, is this a good idea? What are the pros and cons. Need to run through joists so seems the obvious answer, otherwise I'd need joints in the copper between almost every joint. What would they have done pre-plastic...

OK thanks Boilerman, I suppose there is no way of knowing (unless it's visually obvious) until you replace exchanger if its that or not. Correct in saying hard water area and there is no softner.

Difficult to say with out seeing it, did you have any destructions with it. Sorry can't help on that one

You know if it was my job, I'd remove the cast iron soil stack and replace with plastic, then you know your going to have good seals everywhere and not potentail leakages where multikwik meets lead. Yep it will cost more and you'll have to remove bricks but better than bodging in my opinion

You'd need to get a hole saw for that, are you sure its larger?

The waste you just need to tease off, again with a bit of elbow grease, try twisting it from underneath to see if that brakes the seal. Once off clean all excess silicone off and then try with supplied washers, I prefer using silicone as an extra measure

Yep the waste is probably siliconed onto the bath, the overflow should just screw onto each other. Take the overflow pipe off then unscrew the two parts either side of the bath.

OK, maybe I'll look at filters, then blending valve then heat exchanger in that order, as I reckon HE would be most expensive to replace. Thanks for your help Tibbot

OK so low 'flow' thanks for that, sounds like it is going to be a case of trial and error then by replacing certain parts. Presumably there is a flow switch as well, could this be part of the problem. What steps would you recommend?

OK, any ideas then as to why all of a sudden I have low hot water pressure (literally drippling out of all taps) yet the mains cold is fine?

Got very low hot water pressure at all the taps on the following Oil Fired boiler: Worcester Heatslave CF 20/25 Any ideas Thanks in advance

Thank you Hugh for an honest reply rather than an unhelpful remark.

Maybe I've worded it wrong. Lets try again. Can I connect a macerator to inch and a quarter pipe that subsequently runs into a hopper outside, which then feeds into mains sewer as opposed to rainwater

Is there any reason why I can't run a macerator WC directly into the waste pipe of a sink that flows into an open hopper, then into the mains sewer?

Believe me I have searched high and low for a model number, even when covers off there is no model number. There also seems to be no reset button only a fault suppresssion switch. And also can find no where to relight pilot light

I drained my system to change a TRV, since filling it back up i can't get the boiler to fire up. There is no model on the boiler itself and we have no manual withit. It is at least 15 years old but has run unproblematically for years. The system has plenty of water in it, ie (1.25 bars), I...