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No hydraulic separation from the internal circulator, so possibly lots of stress on the internal pump and exchanger if the flows don't match (what your zones require and what the boiler can do). Additionally, the two zones may not get the same temperature water.

How old is it? Ever had the ignition rods/element replaced? If e003 happens often, could be that - about a $15 part. Otherwise, could be the infamous 3 way valve that redirects heating water to the DHW plate exchanger. How I would troubleshoot the valve: open a high flow hot faucet and watch the...

Robenco has a combi boiler, so more piping involved. I talked to several pros and if you bring up modifying or adding equipment, price goes up, even if you go to another tankless but the same brand. I had a couple quotes not too long ago to swap out a CH on warranty and they were about 10K not...

I have a Navien and have read and watched practically everything one can find on the web about it. You can find some videos on youtube and see for yourself. They're fussy, sensitive units but if maintained, they are nice and can last a while. Parts are generally available online. The 3-way...

@QueBall gave some good hints, second those, but I may have one more. Is the condensation oily? Maybe a bit brown? What does your venting look like on the outside? If you scour the web, you'll find some reports on this - exhaust suckback, where the exhaust is too close to the air intake. May...

Hi, long time lurker here - Dana is the absolute expert on this and touched upon this but there are a couple of things I wanted to add, feel free to correct me if I'm wrong. 1. It may be more helpful to think about this in terms of heat dissipation vs. heat capacity. I think it's somewhat moot...