Evohome Opentherm Boiler decision and set up

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts
  • HenGus
    Automated Home Legend
    • May 2014
    • 1001

    #46
    Originally posted by paulockenden View Post
    Not just installed by - annually serviced by too.
    The Atag warranty doesn't actually say that. It states:

    Quote: To maintain any product warranty, your appliance must have an annual service, carried out by a Gas Safe Registered (or Register of Gas Installers Ireland) engineer. Unquote

    That said, I intend to use my accreditted installer.

    Comment

    • fergie
      Automated Home Sr Member
      • Mar 2017
      • 92

      #47
      I was going to go intergas for my OT iS S plan install until they told both myself and my preferred installer that it couldn’t cope with multizones. It seems solutions have now been found, but with a leaking boiler I couldn’t wait too long.

      I went the Atag route which my preferred installer tried to get accredited for, but they seemingly have targets and areas etc which weren’t going to suit him as mainly an intergas specialist.

      I found another excellent installer, who does Atag, but maybe an extra £500 overall. Partly cost of boiler and also his labour charges being higher. Main reason for Atag is that it does what it’s supposed to and the 10y warranty.

      I found the biggest saving for me was simply installing evo to control rads - with the old boiler it saved 20% overnight as we were heating less rooms.

      I would say with OT gas usage is slightly higher than without, but I have both a bigger boiler and the gas fireplace has also been on a bit. The bugbear for me is Evo asking the boiler to run at 70 when there is no need (something I’m hoping they will add settings to control). For me the biggest advantages are thermal control via the app and it is excellent at maintaining set temps.

      Would I bother in a small house? No. In a larger house? Yes!

      Comment

      • G4RHL
        Automated Home Legend
        • Jan 2015
        • 1580

        #48
        Originally posted by fergie View Post
        I was going to go intergas for my OT iS S plan install until they told both myself and my preferred installer that it couldn’t cope with multizones. It seems solutions have now been found, but with a leaking boiler I couldn’t wait too long.
        I always understood the Intergas boiler had no problems with lots of zones. Have I missed something?

        Comment

        • blowlamp
          Automated Home Sr Member
          • Apr 2017
          • 98

          #49
          Evohome's narrow modulation band under OpenTherm control was mistakenly reported as a fault with Intergas boilers. It just turned out that the odds for a multi-zone Evohome setup requesting full boiler output were underestimated.

          Martin.

          Comment

          • fergie
            Automated Home Sr Member
            • Mar 2017
            • 92

            #50
            I may be putting 2 and 2 together and getting 22, but I believe the ‘intergas fix’ is to wire the OT into CH only and the water supply via a BD91 to the combi side. This way the boiler knows what it’s heating and / or CH max can be set on the boiler.

            My installer thinks this would work on the Atag too so may explore it at service time, but would prefer Honeywell to add control via evohome!

            Comment

            • HenGus
              Automated Home Legend
              • May 2014
              • 1001

              #51
              Originally posted by fergie View Post
              I may be putting 2 and 2 together and getting 22, but I believe the ‘intergas fix’ is to wire the OT into CH only and the water supply via a BD91 to the combi side. This way the boiler knows what it’s heating and / or CH max can be set on the boiler.

              My installer thinks this would work on the Atag too so may explore it at service time, but would prefer Honeywell to add control via evohome!
              This is how my Atag is connected. The BDR opens the HW zone valve that closes the CH inline valve. The Atag installation guide mentions the need for a diverter valve. TSet Max can be set on the boiler but manual CH maximum control is inoperative under Opentherm control.

              Comment

              • Dan_Robinson
                Automated Home Ninja
                • Jun 2012
                • 347

                #52
                Originally posted by fergie View Post
                I may be putting 2 and 2 together and getting 22, but I believe the ‘intergas fix’ is to wire the OT into CH only and the water supply via a BD91 to the combi side. This way the boiler knows what it’s heating and / or CH max can be set on the boiler.

                My installer thinks this would work on the Atag too so may explore it at service time, but would prefer Honeywell to add control via evohome!
                Think you got to 32 there dude. The issue was always as Blowlamp described.
                Kind Regards - Dan Robinson (Jennings Heating Ltd)

                Comment

                • 1animal1
                  Automated Home Jr Member
                  • Jan 2018
                  • 39

                  #53
                  Two things today... I've been in touch with my heating engineer who is going to contact ATag about their accreditation which I am chuffed about. Although reading the last page, seems he may have to commit beyond that to an area??? If that's the case I'll have to rethink this...

                  Secondly I have Honeywell coming back to me with a wiring circuit for an optimal opentherm set up, S plan with the zone valve on the HW but also an enhancement on the CH side, rather than being wide open with no zone valve as shown in the guide... Fitting a normally open zone valve which closes upon HW request. Pretty simple and probably minimal benefit, but a bit of fine tuning nevertheless which should aid HW heat up

                  Comment

                  • paulockenden
                    Automated Home Legend
                    • Apr 2015
                    • 1719

                    #54
                    Did we ever come to a conclusion as to the best boiler to go for, currently? As part of a kitchen revamp I'm tempted to replace our ancient (and badly kettling) floor standing Potterton with something smaller, just to regain some space in the huge cupboard where it sits. System is S-plan, open vent. And it currently sucks loads of air in so gurgles a lot!

                    But the matrix of what works and what doesn't, especially when Opentherm is involved, as still as confusing as ever. Intergas is tempting... And maybe switching from open vent to avoid that gurgling!

                    If only one of the knowledgeable installers here in the forums was local!

                    P.

                    Comment

                    • Dan_Robinson
                      Automated Home Ninja
                      • Jun 2012
                      • 347

                      #55
                      As you're Brighton based, there is a chap trading as "Fat Plumber" who is very good and acquainted with Intergas and Atag (although possibly only the original A and Q series boilers).

                      If you plan far enough ahead and SWMBO is on her summer travels, my dad lives near Herstmonceux and would enjoy his youngest coming to stay for a few days I'm sure
                      Kind Regards - Dan Robinson (Jennings Heating Ltd)

                      Comment

                      • paulockenden
                        Automated Home Legend
                        • Apr 2015
                        • 1719

                        #56
                        ooooh. Now there's a thought....

                        P.

                        Comment

                        • originaltwist
                          Automated Home Lurker
                          • Sep 2015
                          • 3

                          #57
                          And it currently sucks loads of air in so gurgles a lot!

                          If only one of the knowledgeable installers here in the forums was local!

                          P.[/QUOTE]

                          The gurgling is probably due to the condensate drain being blocked ... but if you are replacing with a nice new condensing boiler then who cares?
                          The current favourite boiler for open vent heat banks is the Vaillant Eco Plus heat only... not sure if that type is relevant for you? Apart from heat banks and eco-heating I can't claim to be at all knowledgeable but I am local to Brighton.

                          Comment

                          • paulockenden
                            Automated Home Legend
                            • Apr 2015
                            • 1719

                            #58
                            No condensate on such an ancient boiler.

                            The gurgling is due to air being sucked in from the open vent.

                            The main requirement is for a boiler that plays nicely with Evohome, especially using Opentherm.

                            Comment

                            • rotor
                              Automated Home Guru
                              • Aug 2015
                              • 124

                              #59
                              Really keen to hear what you decide on, Paul. I'm very far from convinced that Opentherm is worth all the extra hassle and restrictions on model choice.

                              Comment

                              • paulockenden
                                Automated Home Legend
                                • Apr 2015
                                • 1719

                                #60
                                Intergas is tempting me at the moment. I like the way CH and DHW are split. I'm tempted to stick with stored hot water (vented) but move to an unvented heating loop (combi-style), which I think the Intergas would allow me to do.

                                Unless anyone can think of a good reason not?

                                P.

                                Comment

                                Working...
                                X