Anybody who has Powerflushing equipment would not suggest putting in a magna cleanse as an viable alternative. I have only had a call out on Monday to a destroyed heat exchanger in a 1 year old gas boiler. I cannot stress the importance of it enough.
Regarding Ideals, IMHO they are an ok boiler, fairly low down on my list.
Why do you have to go the SEAI route if you wish to install a Viessmann? That's a new one to me!
I don't have to go down the SEAI route but if I don't the difference in the jobs is €700, as extra pipework will be involved if I want to use it properly. If I do go the SEAI route I get a better quality boiler, zoned heating/DHW controls & a BER cert for €250 when you take the grant into account. If installing the Ideal, he will put a lever valve on my HW tank so I won't waste money heating the water every time I put the heating on which is currently the case. I have a very low HW demand because I have a dishwasher & electric shower.
I have a couple of other questions since getting the quote. It'd be great if you could fill in a few more blanks for me:
Does the installer need to have done a Viessmann course in England for me to get a five year warranty or do I get this anyway?
What should the Temperature Out and Temperature In figures be to achieve high efficiency? I think he said it would be 70 and 50 degrees C. Should the return be less than 50?
I read somewhere that in order to ensure that the boiler is often in condesing mode, it might be an idea to slightly indersize it. Is this advisable?
In case you're interested the two boilers he's quoting for are Viessmann Vittodens 19 kW and Ideal Logic 18kW. I've read that the Logic series is better than past Ideal ranges. I'm not sure if the Viessmann is 100W or 200W. What is the difference in performance?
Do you reckon the installer doesn't have a proper Powerflush machine? I'll make sure to check that he does. Is his reasoning for the magna clean option not valid, i.e. the high velocities of the powerflush could cause a leak on an old system? I was just on to my dad there. He got a WB boiler put in two years ago. Presumably it's a higher output as the house is bigger, they love heat, and use DHW for showers. He said the installer never ran anything through the radiator system! Is this something he can/should get done now? How much would it cost? It's a four bedroom house, think there's ten radiators in total.
Thanks again.