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You have to repressurise. There is a "filling loop" which is a short section of (usually) flexible pipe connecting the cold water inlet to the heating loop. On older systems this was usually external and there would be a tap somewhere near the boiler. On newer boilers it is often internal and...

The number of time slots is configurable from 5 to 30. Overrides are a little complex. You set an override end time when you start the override. You can also cancel the override at any time. I don't think it will cancel itself. The external temperature sensor is entirely optional. The...

I don't think we've quite got to the bottom of the plumbing in this new house, but the basic story is still the same. It is old and it is inefficient but it still costs a few grand to get it replaced.

The government has already cancelled the "guaranteed" FiT for small commercial operations. The domestic one is still in place, but a new government may always mean a new law. In this case it isn't likely to get cancelled any time soon because it isn't costing the government anything. If...

It's called a pilot light. Maybe you aren't old enough to remember those :) You will have to find out whether your meter is reading cubic feet or cubic metres. I assume you are including the last two digits, so that your reading is just over 1 unit in a day (12 hours?). That is way high if...

Sure you can mix, but as you've seen it isn't a great idea. Going completely over to two pipe will probably solve your cold radiator issues. You also should consider a room stat since you're making all those changes.

Before another brawl breaks out, it might be worth clarifying just what the situation is. "Lack of pressure" may well be lack of flow which is an almost universal problem with electric showers. If the shower is crap (which it is), but the mains pressure is good (which it may or may not be)...

Stats controlling valves? So who is controlling the boiler?

Two stats, two zones, I assume? No TRVS? The boiler will be on whenever either of the two stats is calling for heat. Hence it will be off only when both are not calling for heat. Both of your stats will be switching themselves on and off several times per hour and most likely having no...

Yeah, I'll elaborate. They don't work :) When one of them comes with a meaningful guarantee that you won't get any scale while it is fitted, then you should fit one. Until then you are most likely wasting your money.

I don't know if I mean anyone in particular. I just see a bunch of people saying controls that turn your heating down to 40C will save you enough money to buy a new house. Then a bunch of people say that boiler cycling is the worst thing since The Beatles split up. Maybe two different...

I could comfortably heat my house with a 5kW boiler, and it is detached. I dread to think how long a bath would take with a 5kW combi and a shower would be impossible. The old 27kW nominal (19kW output) combi I used to have was just about OK both for shower and bath and very few people would...

This is a big and heavy boiler, but mostly that's your fitter's problem. Make sure he is properly insured for when the three guys it takes to get it up there plus the boiler, all come crashing through your ceiling :mrgreen: Boiler is OK. Not the best on the planet but reliable enough and...

When you work that one out, you'll be a wise man, my son ;) Perhaps also you'll be able to offer better service to your customers. 1k, straight swap for a dirt cheap boiler, unregistered guy, no paperwork You can get a good boiler fitted properly (straight swap) and legally for less than...

Almost all the points have been covered, but there are additional reasons to leave an outside tap unsoftened. Softened water isn't good for most plants, although hard water isn't ideal either, and there is certainly no benefit in running through a month's supply of softening salt by putting the...

So it looks like you came to the wrong place, Samo. These guys can get within about 30% by sticking their finger in the air, but seem to lack the intelligence to realise that heat in = heat out and it can be calculated. Of course whether the added precision is meaningful or not only you can...

Sometimes electronics are a step backwards. People are not thermometers and they can feel warm at an air temperature of 16C one day and cold at an air temperature of 20C on another day. Any controller that fails to recognise this is a nightmare. The Danfoss controllers seem to be more...

Weather compensation and boiler (temperature) modulation are two completely separate things. Please can everyone stop spouting "weather compensation" as if it is the only way to control the flow temperature of a boiler.

Interesting idea. The effect is of increasing the flow temperature by 10C-20C compared to before. How will this work with your temperature modulating controller? You may be able to get very similar results simply by increasing the flow temperature by 15C on the original setting. It will...

If it is still the same model, then it is basically the same as the Salus but with a few useful tweaks. The manual has pictures that should let you understand how to work it! It has a manual mode which is equivalent to an "on" setting. The Salus doesn't have this, only a temporary override...