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No, it contravenes the Water Regulations. I don't recall the details off-hand, but the heating system contains a contaminated fluid. The only legal way to connect it to the mains is with a pressurization unit (break tank and pump) or an RPZ pressure reducing valve arrangement. The latter is...

Spacers are available (for Talon & other brands) clips to provide the stand-off required for insulation. The spacers can be stacked to provide more space. The clip-together pipe clips are fairly useless.

25 year guarantee, which you'd invalidate if you were to fit the wrong pocket or if you don't have the G3 certification (that you should really have). I wonder why a thermostat pocket should start leaking, it's not subject to stress or high flow rates.

The felt insulation is very flammable and almost useless as insulation. It's sold as insulation to idiots who know nothing about insulation.

It won't work fine, unless the sensor is shrouded to keep sunlight off it. The sensor is meant to measure air temperature and it won't do that if it is in direct sunlight. Put your hand on a car that has been standing in sunlight and see whether it feels warmer than the air temperature...

More like doing a steady 50, instead of having an on/off engine that accelerates to 80, switches off and coasts to 20 and then accelerates to 80 again.

It has to be a defective sensor or a heat source of some sort; reflected sunlight, a warm air discharge (extract fan, outdoor AC unit, car parked below sensor, etc..). The sensor is meant to be measuring air temperature; in reality it measures its own temperature and the assumption is that the...

It could be a huge water draw off in the area. The suppliers have a legal responsibility to maintain a minimum pressure at the mains connection at all times. IF the mains pressure is being lost overnight (you're not certain that it is ), THEN there is a risk of mains...

It is to do with energy losses due to friction with the pipe wall. The total energy in a mass of moving fluid consists of height, velocity and pressure components. You can express the total energy, the sum of all 3 components, as head/height i.e., H total = h + v^2/2g + P/ρg according...

It doesn't. The central heating would only slowly clog up if there was a corrosion problem (pumping over, a leak, galvanic corrosion, etc.). Power flushing is not routine maintenance, it is a remedial action to attempt to recover a damaged system, frequently caused by incorrect installation.

Maybe the water in the trap has just dried out, letting sewer smells into the kitchen. Tip some water down it and see if the smell stops.

Put the plug in, fill it up and check the overflow isn't blocked.

The pipe manufacturers usually make a sleeve for that purpose.

Lead-loc, good up to 80 degC, joims to metal or plastic. http://www.melimatic.com/4.html You need to replace the lead, but you know that. There's something in the Water Regulations about the galvanic series and the sequence in which you can connect different metals, but I don't recall which...

Look at the installation manual, usually available online. Most modern boilers use thermistor temperature sensors which are low voltage devices. Most of them can also be configured to work with thermostats, to accommodate the dinosaur installers who have failed to notice that electronic...

Optimum Start/Stop (OSS) . Weather compensation is a different feature whereby the heating flow temperature is adjusted according to the outside air temperature (which is proportional to the steady-state heat losses). OSS is common on commercial BMS heating/cooling controllers. There was...

And when the entire system is at its maximum working temperature, the water level should still be a good few inches below the level of the overflow. The operative word here is that it's an Expansion tank. Lots of them are incorrectly set up as water storage tanks. The damage that can be...

Yes, in theory. In practice they're both a waste of effort. Gate valves only regulate over the last turn or half turn and then generate noise. The first time any maintenance is done on the taps, the gate valve will be shut and then fully opened on refill. Double-regulating valves were...

Yes. If they're not balanced, all the flow from the secondary pump does a quick short circuit around the loops(s) nearest to the pump. The further loops get no circulation. The balancing valves need to be capable of regulating very low flow rates. Those used for heating are fairly useless...