Device to switch a 220VAC/40A resistive load
You can buy a "50A" zero-crossing SSR for about $50 and a similar "75A" SSR for $77 in singles, plus maybe another $30-40 for a suitable heat sink. Isolation built in, so much nicer to work with. 

Don't assume reliability will be better with semiconductors, however lifetime may be better if the number of switching operations is large. Semiconductors can fail at any time due to surges (and will typically fail on) relays wear out and tend to fail off. Thermal cycling due to self-heating can also shorten the life of power semiconductors. 

Edit: There's also the non-UL-approved Chinese specials on eBay for much less if you're into that sort of thing.