My central heating has never quite worked properly since installation and the reason has been largely due to a large boiler and multiple heating zones. It's a Vaillant 438 and I have 3 zones - 2 heating and one HW. The advice has been to install a low loss header and I've finally decided to invest the funds to do so. Future plans may be to install 2 smaller boilers, if that makes any difference to the advice given.
I wanted to get advice from the pros on whether the below setup makes sense. Finding domestic installers with experiece of LLHs is difficult and I want to have some knowledge of what's entailed before I choose somebody, to avoid getting an inadequate installation which is what happened first time around.
From what I've learned reading every post I can on LLHs, I've come up with:
1. Primaries from boiler into LLH with a 15/60 pump.
2. Secondary circuit for heating split into 2 zone's via zone valves, running off of a 25-80 pump. (This required because of the large index circuit on both upstairs and downstairs zones).
3. Secondary circuit to DHW with a 15/60 pump.
Does that sound basically right? Or should all 3 zones be separated off of the LLH? I wanted to avoid having to buy a second 25-80 if I can.
In terms of the LLH itself, would something like the Worcester Bosch 7716192614 suffice? Is there anything I should be looking out for when choosing a LLH?
Thanks.
I wanted to get advice from the pros on whether the below setup makes sense. Finding domestic installers with experiece of LLHs is difficult and I want to have some knowledge of what's entailed before I choose somebody, to avoid getting an inadequate installation which is what happened first time around.
From what I've learned reading every post I can on LLHs, I've come up with:
1. Primaries from boiler into LLH with a 15/60 pump.
2. Secondary circuit for heating split into 2 zone's via zone valves, running off of a 25-80 pump. (This required because of the large index circuit on both upstairs and downstairs zones).
3. Secondary circuit to DHW with a 15/60 pump.
Does that sound basically right? Or should all 3 zones be separated off of the LLH? I wanted to avoid having to buy a second 25-80 if I can.
In terms of the LLH itself, would something like the Worcester Bosch 7716192614 suffice? Is there anything I should be looking out for when choosing a LLH?
Thanks.