Thus, it was not done, had to rebuild the drain because of this boiler is greater, so I bought a new Syphonsatz for space saver, this we needed 2 reductions, because the connections of the boiler are 1/2 ". In addition, there a distributor for the angle valve in the wall, half a meter long tube, which is inserted to the combination valve, the other end. in the drain before the siphon, all sealed with silicone
Do not say that the combination valve must be screwed with hemp, please do not with poetry, because then the valve is not working because the throughflow holes would be sealed with a seal inside the valve.
Following this work, the time had come, the commissioning ...
Check all hoses and connections connected, plug, device still switched off in the outlet, angle valve turned up, wait until is full, rinsing with combination valve, you can not go wrong, very good step by step in the instructions.
Device works perfectly, we're thrilled.
Made in Bulgaria ;-)