Hi all
Wondering if you could help with this strange issue.
I have a Vaillant ecotec 637 (set to 20kw part load) which was connected via a LLH to my system of 3 zones; DHW and 2 radiator zones. The gas usage was high and didn’t feel the boiler was modulating, so yesterday I decided to remove the LLH and just connect directly to the boiler. I noticed today with the target temp of 75, the boiler was sat around 60 after an hour and even after a few hours it’s only just about got the 70degC. Also when initial heating called for the boiler modulates down to a small flame and takes a while for it to ramp up.
This is strange as with the LLH I never had this issue and easily got the target temp and stayed there. Now I know most likely I’ll need to refit the header, but wondered why the boiler doesn’t ramp up straight away?
Thanks in advance
Wondering if you could help with this strange issue.
I have a Vaillant ecotec 637 (set to 20kw part load) which was connected via a LLH to my system of 3 zones; DHW and 2 radiator zones. The gas usage was high and didn’t feel the boiler was modulating, so yesterday I decided to remove the LLH and just connect directly to the boiler. I noticed today with the target temp of 75, the boiler was sat around 60 after an hour and even after a few hours it’s only just about got the 70degC. Also when initial heating called for the boiler modulates down to a small flame and takes a while for it to ramp up.
This is strange as with the LLH I never had this issue and easily got the target temp and stayed there. Now I know most likely I’ll need to refit the header, but wondered why the boiler doesn’t ramp up straight away?
Thanks in advance