Manufacturers tend not to make huge combi boilers as it's generally assumed that a house that needs a lot of heating will also need a lot of hot water, and therefore a combi would be unsuitable due to it's relatively low hot water output.
The ATAG Q51C is probably your best bet if you really do need/want this kind of setup
rinnai 26i and a 40kw system boiler then. personally I would do a heatless calc to make sure I need a 40kw boiler.
must say the viessmann 35kw 200w system boiler is good for big homes. got one heating a 200 year old 4 story plus celler house no bother...weather comp'ed of course
if its found to need 30kw then intergas would be my preference
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