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Not banned, Dick, just busy elsewhere. You seem to be in your usual form.

A Navy shower? In salt water? Or with sailors? Do you turn off the water whilst soaping? We need to know these things.

How do you know that it is always below 20 degC if you don't monitor the temperature constantly? You asked about thermostats, not temperature sensors. If it's not in use, then how does the entire water volume get changed every 24 hours? The HSE have looked into this and that is their...

Read the Fernox page here; http://www.fernox.com/problem+solving/how+to+sheets/reducing+boiler+noise Hydrochloric acid removes limescale, which can only accumulate if there has been a long-term water loss (slow leak, pumping over, F&E tank incorrectly set up, etc..). It causes 'kettling'...

Forget the wi- fi network, just google for some wireless thermostats or sensors. Transmitter at the tank, receiver module at the controller. It may be cheaper to pull in cables. More importantly, you should not be 'mothballing' a HW storage cylinder, it will be a legionella incubator. If...

A similar statement, about energy savings due to lower air temperatures, features in one of the UFH system design guides; it was produced by BSRIA or some such body and is, I would hope, backed up by research and not a manufacturer's stretching of the facts. I'd go and look it up if I was...

Yes, according to the HSE (L8, Control of legionella in water systems). Store at 60degC. The thermostat/temperature sensor is usually about 2/3rd of the way up the cylinder and the legionella colonises the colder water at the bottom of the cylinder amongst all the limescale that has...

Quick question (I hope). I need to tidy up the wiring to an outside light, fitting an internal switch. I could replace an existing switch with a 2-gang switch and connect the two L1 terminals so as to provide power the outside light. The circuit is RCD protected. Are there any reasons...

Isn't imperial size pipe measured on the ID? Metric tubes are OD. BES do 1 3/8" pipe, listed under the refrigeration supplies, No. 13995. 1 3/8" OD is nearly 35mm; they do that as well, but don't know if it would suit your purpose.

Yes, and when the floor-standing cast-iron natural draught boiler got scaled up, it started kettling, you descaled it and started over again. Boilers have changed somewhat and don't hold as much limescale as they used to.

As a guy that wouldn't fit a remote kit, for the reasons stated, I doth protest too little methinks.

You're not going to answer the question then. There's a flaw in the concept. Continuous fall; ensures the discharge pipe isn't full of water. The last PRV I saw in a basement had a drain capilliary run to the floor. It would make the floor wet, but the discharge pipe (about 2" ISTR) was...

It shouldn't open at all until it functions. Then the discharge pipe should be unused and clear, allowing the unimpeded discharge of steam and water to the atmosphere. You can't guarantee that the innards won't get blocked, but sludge would most probably block and perforate the heat...

The arrangement that has been described on here is wrong and both you and LeeC have evaded the relevant question. If you're going to discharge the boiler PRV into a CH pipe, then how can you, as the installer, guarantee that CH pipe is not, or will not become, obstructed with sludge, the...

I don't have them. Why would they cap the boiler PRV? If the secondary PRV operates at 2.5 bar, then the boiler PRV should never operate, unless the secondary had failed. If what you say is correct, then I'd suspect it contravenes the relevant BS and I expect Vaillant will withdraw...

I looked it up. Baxi do a remote PRV for their Neta-tec combi. The installation instructions say; "4. A remote relief valve kit is available to enable the boiler to be installed in cellars or similar locations below outside ground level (kit no. 5121379). 5. A boiler discharge pump is...

Oh, it's Drivel! I've been away, I thought he must be dead by now.

FFS! This has to be a wind up. The manufacturers have got their terminology wrong now, have they? It is called a secondary device because it is, secondary to and in addition to, the primary PRV which is on the boiler. The boiler PRV discharge is to be piped as per the instructions, to...

No they do not. Link please. The device you have posted a link to is a Secondary PRV for installation on a heating system. It operates in conjunction with the boiler PRV, it does not replace it. There is still a statutory need for a PRV on the boiler that discharges to atmosphere. This...

No. You cannot be serious. How would you know that it (the first PRV) had discharged? How would you test it? How would you know if it was letting-by? The safety device must be on the boiler. It is a safety device and is not to be buggered about with.