B
bigjr
For the last 30 years our house has been very successfully heated by a 70/90 Myson oil fired cased boiler in the kitchen. 1 flow + 1 return on one side for gravity DHW system and 1 flow + 1 return on the other side for pumped radiator circuit. My heating engineer advised that the boiler should be changed for greater effeciency. Unfortunately a condensing oil boiler was not an option due to difficulties in installing a suitable flue. Therefore he installed a new conventional oil boiler of the same output capacity. This new boiler has just 1 flow and 1 return connections on the top facing upwards. The heating engineer has fitted the branch of a 28mm tee to each of these connections and joined one side of the tees to the gravity DHW and the other side to the pumped radiator circuit.
The gravity DHW circuit is not heating the hot water in the cylinder to anywhere near the previous temperature, presumably because the pumped radiator circuit is drawing all the water from the boiler flow tee. My heating engineer seems to be uncertain as to the best way to cure the problem and is talking about experimenting with different modifications to see if anything works.!!!! I would be interested to learn if a new conventional boiler with 2 top connections can ever be plumbed successfully into a gravity DHW system originally designed for a boiler with 4 side connections? What is the most practical way to reconfigure the system?
The gravity DHW circuit is not heating the hot water in the cylinder to anywhere near the previous temperature, presumably because the pumped radiator circuit is drawing all the water from the boiler flow tee. My heating engineer seems to be uncertain as to the best way to cure the problem and is talking about experimenting with different modifications to see if anything works.!!!! I would be interested to learn if a new conventional boiler with 2 top connections can ever be plumbed successfully into a gravity DHW system originally designed for a boiler with 4 side connections? What is the most practical way to reconfigure the system?