Finally getting round to hooking the woodburner up to the thermal store and while i'm at it putting connections in for the eventual gas boiler which will heat the place when i'm too lazy to cart timber in (goes through a fair bit when running the heating as well....)
Plan is an Intergas-looking at the Rapid 32 cos that can definitely run as open vent plus combi, am open to other suggestions but the heat side will be open vent (direct heating the thermal store) and i do want the combi as well (dhw for the 2 bathrooms will come from the thermal store via plate hex, dhw for kitchen & utility from the combi).
Question is really with the pipe layout, all the open vent boilers i've encountered require an expansion pipe running straight ish up from boiler to above the header tank. Is this still required on the Intergas in open vent mode or does the built-in pressure relief valve obviate that requirement? (The install drawings all show pipes running down but I'm no heating engineer so not taking that as gospel)
And follow-up question (in case the more modern Intergas jobbies will better suit my purposes) do they all have the PRV blowing into the condensate drain and the mode switch that allows open vent operation? Suits me fine if they do, i've got power, drainage, cold supply and a roof at the proposed location but no outside wall for the PRV to discharge through.
Before anyone starts i'll not be installing the boiler myself, just want to make sure my plan is feasable so if anyone who quotes tells me i can't do it like that i'll know to bin them off
Ta in advance
Plan is an Intergas-looking at the Rapid 32 cos that can definitely run as open vent plus combi, am open to other suggestions but the heat side will be open vent (direct heating the thermal store) and i do want the combi as well (dhw for the 2 bathrooms will come from the thermal store via plate hex, dhw for kitchen & utility from the combi).
Question is really with the pipe layout, all the open vent boilers i've encountered require an expansion pipe running straight ish up from boiler to above the header tank. Is this still required on the Intergas in open vent mode or does the built-in pressure relief valve obviate that requirement? (The install drawings all show pipes running down but I'm no heating engineer so not taking that as gospel)
And follow-up question (in case the more modern Intergas jobbies will better suit my purposes) do they all have the PRV blowing into the condensate drain and the mode switch that allows open vent operation? Suits me fine if they do, i've got power, drainage, cold supply and a roof at the proposed location but no outside wall for the PRV to discharge through.
Before anyone starts i'll not be installing the boiler myself, just want to make sure my plan is feasable so if anyone who quotes tells me i can't do it like that i'll know to bin them off
Ta in advance
