After much toing and froing, I settled on the Atag IS32 system boiler for my new install.
The main reason for this is that Hengus and others had got Atag to work well with OT Evohome. It is also an extremely efficient boiler with warranty extended to 10 years. I'm also told that it is designed to last 18.
Though the IS32 is maybe slightly on the big side, I felt the IS24 (replacing a struggling and leaky Glowworm 24) was going to be too small - especially as I heat a lot of water for showers and filling a 160 litre bath (210 litre storage tank). I'm also planning an extension + garage conversion in the future.
My original setup was evohome standing alone (no boiler control) and controlling 12 radiators. I had a Glowworm 24 heat only boiler in S plan with fully sealed system - pump, expansion and storage tank in the airing cupboard. I found the evohome reduced gas usage by about 20%, but that was one month of test data toward the end of winter.
My new set up is the Atag iS32 controlled via Opentherm with hot water priority. Though the installer removed the old pump (it was making a lot of noise which partly swayed the choice to change to a system boiler), he decided it was best to keep the expansion tank. He seemed to be fine with the wiring side of things and was happy also installing the Evohome hot water kit. I took care of the pairing and evohome programming set up. I have 11 zones + hot water control.
The main difference is the new boiler is whisper quiet. I also no longer have any clanking etc as the pump starts firing up. The storage tank reheats extremely quickly and the evohome seems to be settling down well with the new boiler.
The main reason for this is that Hengus and others had got Atag to work well with OT Evohome. It is also an extremely efficient boiler with warranty extended to 10 years. I'm also told that it is designed to last 18.
Though the IS32 is maybe slightly on the big side, I felt the IS24 (replacing a struggling and leaky Glowworm 24) was going to be too small - especially as I heat a lot of water for showers and filling a 160 litre bath (210 litre storage tank). I'm also planning an extension + garage conversion in the future.
My original setup was evohome standing alone (no boiler control) and controlling 12 radiators. I had a Glowworm 24 heat only boiler in S plan with fully sealed system - pump, expansion and storage tank in the airing cupboard. I found the evohome reduced gas usage by about 20%, but that was one month of test data toward the end of winter.
My new set up is the Atag iS32 controlled via Opentherm with hot water priority. Though the installer removed the old pump (it was making a lot of noise which partly swayed the choice to change to a system boiler), he decided it was best to keep the expansion tank. He seemed to be fine with the wiring side of things and was happy also installing the Evohome hot water kit. I took care of the pairing and evohome programming set up. I have 11 zones + hot water control.
The main difference is the new boiler is whisper quiet. I also no longer have any clanking etc as the pump starts firing up. The storage tank reheats extremely quickly and the evohome seems to be settling down well with the new boiler.
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