I have my boiler (Vaillant Ecotec 18kw) set on 14Kw and max flow temp of 62°. I also have my pump set on the slowest setting in the belief that if the water is flowing through a radiator slowly, there’s more chance of extracting the maximum heat from it before it returns to the boiler. The system works fine and keeps us warm and supplied with hot water even on the coldest day.
While I was poking around up in the loft today (where the boiler is situated) I noticed the temperatures of the flow and return as I have a clip on analogue thermometer on the flow and return pipes. The boiler was sitting at 62° but the thermometer on the flow was saying 40° and the return 24°. The flow pipe was too hot to touch for anything more than a few seconds and the return was lukewarm, as you would expect. The boiler had been running for some time.
Two questions just out of curiosity - I don’t plan to change anything but should the flow thermometer have shown 62° and if not, is a 16° drop between the flow and return enough to make the boiler condense?
While I was poking around up in the loft today (where the boiler is situated) I noticed the temperatures of the flow and return as I have a clip on analogue thermometer on the flow and return pipes. The boiler was sitting at 62° but the thermometer on the flow was saying 40° and the return 24°. The flow pipe was too hot to touch for anything more than a few seconds and the return was lukewarm, as you would expect. The boiler had been running for some time.
Two questions just out of curiosity - I don’t plan to change anything but should the flow thermometer have shown 62° and if not, is a 16° drop between the flow and return enough to make the boiler condense?