The bigger wattage elements will heat quicker and consume more power
If they fit , they will work but you may have to check the amperage capacity of the circuit breaker
I imagine you are meant to replace the existing elements which woukd have been half what was purchased
SOURCE: I can't get 240v across the bottom element. Where
If that is indeed so you have a "Short" between Phase and Earth. .. YES one should have the mains Voltage across the Load, But NEVER anything between Phase & Earth. Look think of it all like this. The Phase comes in, to a, say, a switch, from switch, to thermostat, from thermostat, to One Side of the "Load" Element. The "Other side of that "Load" Element then goes to Neutral. Circuit Complete. Two elements, wired in series would indeed split the Voltage, if wired that way. If done like this, but if wired in parallel, then, again Both would have One End, connected to Phase, & the "Other" side(s) would go to Neutral. Thus the circuit is complete. Some setups are more complex, and use two elements. but essentially all the same. The elements could be wired in series or parallel, depending on current draw/resistance. The Phase is the wire always "Broken" and the Neutral is always "Common".
BE CAREFUL.
SOURCE: I have a Titan N-120
I have not worked on this model of heater. I have several trouble shooting tips for you to try. This is the approach I would use if this were my heater. But first, you say it lights up for hot water then you ask about elements. Is this electric or is this gas fired?
If it is gas fired, it is lighting (a burn sequence) and not heating, I would suspect a flame sensor problem. The fire comes on but the sensor cannot 'see' it so the safety turns the gas valve off. If it is gas fired, there probably is a electronic ligniter ... I would take a look at that to make sure it is lighting. Normally, this is a strip of metal that heats up red hot or a sparking device. Look for the red light inside near the burner or listen for the spark.
If it is electric, I would turn the power off and with a volt/ohm meter, I would measure the resistance on the elements. Set your meter to oHm for this reading. You should read "short" if the elements are good. (Short is the same reading you will get if you cross the probes (direct contact one to the other)) If there are two elements, check both. This is step one in proving the elements. If they both check good, turn the power back on and check the voltage (set meter on 250 VAC or higher) Place the probes on the screws that hold the wires to the elements. Now then, if you get a reading (Is this 110 VAC or 220 VAC - read the volts on the meter) Your thermostat is fine. To prove this, turn the thermostat off and the voltage will drop to zero. If there are volts and still no heat, I would suspect the elements are indeed faulty and should be replaced.
I hope this answers your question. Thanks for your visit to FixYa.com today.
SOURCE: I have a titan 120
Replace the element it is shorted out.
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