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Sorry cbf must have missed your post when reading question. But at least we agreed. Dan where did you get your info on being able to discharge into metal pipes? If your correct could save a lot of time and hassle.

Condense is acidic. Not sure what it contains but needs to be discharged correctly. Best practice is to discharge internally. Confidence should not be discharge via or into any metallic pipe. Soakaways need to be the correct distance from any foundations or footings.

If the timer controls the boiler and is in the same room as the zone valves. Connect the zone valve orange to the call wire to the boiler.

Weather comp is not dependent on good insulation but economy is. If you want different temp at different times the viessmann weather comp doesn't do it. A programmable room stat with a constant temperature output however will. You should consider if that is actually what you want. It's hard if...

If you do need to use remote stats the bdr will be with the stat when you buy it. Can you clarify how many room stats you have and what effect if any do they have.

Spot on mike. I would avoid the complicated answers until the simple ones are explored relays are great if you need them but you may not.

How is your hot water controlled is their a third zone valve?

No zone valves or room stats on my installs. Mixing valves divicons weather comp. I assumed the sparky was out of his depth so ignored his statement. If the clock can control the boiler there a wire to it somewhere. The clock is in the room with the zone valves. If it's two zone valves for...

Where is the boiler? How many room stats do you have? How many channels on the programmer? Where is your cylinder? Is the system fully pumped or semi gravity?

Dan why the relay? Why not use the zone valve relay? How many channels does the timer have?

I rest my case.

I'm not sure if I've missed something but this is an a plan plus. Just use two cm927s to control both areas and leave the existing timer to run your hot water. You can download the wiring diagram from the Honeywell Web site and substitute the timer and room stat for the cm927. The cm927 is a...

Not on my say so. Look at them for yourself. I can only say what I have experienced. If you have your own first hand experience I can't argue. But all I hear is second hand rumor. I mainly repair boilers and judge them on their ease to access and change components as well as there overall build...

Repeating rumor is not a substitute for knowledge. I think you are talking about the wb1a that was released for the UK. The current 100 is a near perfect boiler surpassed only by the 200 in the UK. Unfortunately the 300 is no longer available in the UK. As for there after sales, when I worked...

Where does it come out from? Vaillant is my second choice. Very good boilers. Weather comp isn't to good but most installers will not have heard of it. If they have probably won't understand it. If you have time to investigate weather comp you may like to look at the Viessmann 200. If it's not...

Turning on the central heating was just to ensure the boiler was running. If the valve is open and the boiler running then if there is no scale the primaries will flow due to differential buoyancy. You have now proved you have a controls issue. The sequence for the controls can be checked with...

The room stat should not effect the water temperature. The boiler stat may. Try turning up the boiler stat and lock the valve open. Turn up the room stat to ensure the boiler is kept on if water controls are faulty. If you don't get hot water it is almost certainly scaled up. I interestingly had...

It's easy to ridicule and criticise. This negative attitude achieves nothing. Use you energy positively and increases your knowledge rather than celebrating you own ignorance.

Before you replace the motor and stat. Lock the valve open with the lever at the end of the valve. Run your heating for the next hour with the room stat turned up high. If you have no hot water after an hour think again. If you do it's controls. To answer you earlier comment. The scale I was...

I think some manufactures would be fearful if some installers didn't fit their products it could lead to the boiler being blamed for there inferior work. Mystery man is one of the most outstanding engineers on this forum. Notice how I differentiate between installers and engineers.