Even less HD's http://www.talonfiremage.pwp.b…1epuk8nrd2chmwxoixbolyjb4
Running SUC reactors with one chamber is risky IMHO because you have a low ignition temperature. I'd use at least one extra chamber in those case.
Also, how can you expect someones first reactor to pump 3 water buckets per second to it? That's probably not going to end well.