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Im was reading an artical the other day on how city and guilds are raising the grade boundaries of their gas courses, i think it's a good move to prevent archaic opinions such as those mentioned above. Gas chambers really? I assume you are unable to understand the controls on the vitodens 200...

CT and VT are standard term's not viessmann ones. The controls are easy to use if its been explained and full weather comp is the best thing to happen to the industry for a long time, the old boys just need to get there heads round it. To be honest theres no defending the first boiler they...

18 bar thats mental???? I test as per BSEN 8558 its 1.5 times working pressure for 1 hour for metalic pipe and less for elestomeric pipe.

use a viessman vitodens 200 with sub mounting kit. The boiler will control everything, no need for time clocks, zone valves, or cylinder stats. You get 2 CT circuits for DHW and UFH and 1 VT circuit for heating rads. why would you use anything else??

efficiency is calulated on a log scale and makes bad boilers look better. for true efficiency find out your FGT and compare its to the fuels burning point.

no i wasent either, however we are talking about to different parts made by two different companies. if it was a large industrial motor it may be well engineered but we are talking about a £60 fuel pump.

i had this the other day with a danfoss oil pump, called them and they said the just slacken off the screws then gave some excuse :)

oh ok, so to see if the pcb is working correctly?

Hi im relatively new to this, just waiting for my gas safe to come through now, why would you need resistors ect? can you not just use a multimeter?