Can contactor be replaced with solid state system?
120v Fiorenzato

Current contactor 4NO 20A
4NO as the supply to the element is seperated into 2 each of 14g wire
and perhaps the individual contacts are not rated high enough?

http://support.automation.siemens.com/WW/llisapi.dll/csfetch/6006460/505078910DS01.pdf?func=cslib.csFetch&nodeid=6006461

Sort of found it

Help switching to solid state contactor for steam boiler on 2003 La Marzocco Linea 2av

The Quickmill line of hx machines are fitted with a 25 amp SSR having a 110-120 AC voltage control signal which switches a 1400 watt heating element. Those SSR's are mounted to the machine's stainless steel chassis with machine screws and thermal compound.

If I remember correctly, your Fiorenzato has an 1800 or 1900 watt element so, something in the neighborhood of a 35 to 40 amp SSR would seem appropriate if mounted in the same manner.

In moving to a solid state relay...

Can I bypass having both poles switched, as it is configured currently?
And leave neutral permanently closed and only switch the hot side to the element ?

Hesitatingly, I say "yes" as that is certainly normal practice with 120 VAC circuits. Make sure you know what is neutral and what is hot as wire colors CAN BE misleading.

But before I start replacing components, I would have a firm grasp of what wires are control and what wires are controlled, i.e. how about a pic or two ? Given your description, you should have 6 wires connected to the relay.

Would you believe it goes to 11? (been waiting a long time to use that)

As shipped from Fiorenzato:
A1 coil. 2 neutral wires
A2 coil. 1 hot wire downstream > boiler thermal reset > pstat > gicar)
1 contact. 14g wire black line
3 contact. 14g wire black line
5 contact. 14g wire white line
7 contact. 14g wire white line
2 contact. 14g wire black load
4 contact. 14g wire black load
6 contact. 14g wire white load
8 contact. 14g wire white load

120v at 1 or 3 and 5 or 7 anytime
120v at 2 or 4 and 6 or 8 with A2 energized

Boiler is in the way of meaningful as configured photo.
This is a plumbed machine.
I am the guy that added the dedicated 20amp circuit, not that this increases your comfort level, and wired the machine to that circuit. Representative:

I understand the three connections at A1 & A2.

I ASSUME that contacts 2 & 4 both go to one side of the heating element and that 6 & 8 go to the other side.

I suggest you develop your own wiring diagram for all of these connections to the mechanical relay. I can e-mail you a starter diagram from the Quickmill Anita or you can download it from my crude FTP site below my sig.

yes
2+4 to one terminal
6+8 to the other terminal
no worries i got it sorted, thanks very much

Completed
Used this
https://www.grainger.com/Grainger/wwg/search.shtml?searchQuery=6C904&op=search&Ntt=6C904&N=0&sst=subset
Changed double 14g wire to single 12g
Neutral is no longer switched