I'm gearing up to upgrade from an E61 HX (specifically Lelit PL62 Mara, early version with p-stat) to a double boiler. I'd like it to have a rotary pump, both for reliability and pressure consistency, and a built in reservoir (I'm renting, so plumbing in will require dealing with my land lord, which I'd prefer not to do).
There are a ton of DBs with rotary pumps on the market. My question is, which are the most reliable and will require the least unplanned maintenance if cleaned consistently and serviced regularly?
A slightly related question (or maybe not), is why is it that none of the 1 group E61 group DBs carry NSF certification? I don't need NSF, and I wouldn't expect it to signify reliability, but the fact that all of the NSF certified 1 group DBs use alternative groups makes me scratch my head. (Or perhaps I'm wrong, and some of the E61 1 group machines are NSF certified)?
I'm 5 years into my Lelit. Over that time it has required 2 p-stat replacements, a hose, some corroded wire, a pump replacement, and a group kit. And I'm about to take it in again for another unplanned service (boiler has hit 2 bars resulting in safety valve venting 3 times in the last week, and the p-stat is new). I believe I maintain it properly. I clean it often, and I have always brought it in for a planned service annually. This amount of maintenance may be the result of my machine being an early release. (I know that this model later switched from p-stat to temperature probe with PID control.) While the parts are inexpensive, and my local tech has taken pity on my and has been teaching me some tech skills so I can do some simple service on my machine, I'd really like my next machine to be more reliable.
Among the current crop of E61-based DB rotary pump machines (eg ECM Synchronika, Rocket R58, Profitec Pro 700, Izzo Duetto, Quick Mill Vetrano 2B, and I know there are others), is there a standout from a reliability/maintenance point of view? Would I gain anything (reliability wise) if I were to step up a notch and go to a LMLM, or simply forget the E61 and go sideways to a La Speziale?
Typical usage for me is 4 caps a day, typically with one power down/ power up in the middle of the day, although occasionally I leave it on all day in which case it runs for ~16 hrs. Occasionally I have guests and so serve more, but never more than 12 in a day. I'm not concerned about sustained rate, and when I have guests, I wouldn't pull more than 1 double shot per minute.
Thanks in advance for any advice!