Electric water heater installation, the simplest swap there is

Everyone else ranking for this is paid when you say yes. Here's when you shouldn't.

• The space could host a heat pump water heater and you are staying put. A heat pump unit is broadly the same tank with a different top, and it uses substantially less electricity for the same hot water. If you have the air volume, a drain and tolerance for the noise, fitting plain resistance is leaving a lot of running cost on the table for a modest upfront saving.
• Electricity is expensive where you live and gas already reaches the heater. Where gas service, sound venting and a reasonable gas price all already exist, switching to resistance electric usually raises your running cost for no structural benefit. Compare your own utility rates, not national assumptions.
• Your panel is full and a service upgrade is not in budget. Tandem breakers and creative lug work are not a solution to a genuinely full panel. If the electrical cannot be done properly, that needs to change the plan rather than get worked around.
• You are replacing because the water is lukewarm and nobody has tested the elements. A single failed element on a two-element tank produces exactly that symptom, and an element is among the cheapest parts you can buy. Have it tested before you buy an appliance.
• Your household regularly overlaps heavy hot water draws and you are sizing like-for-like from gas. Slower recovery is real. Either size up or accept a different experience — but decide it now, rather than discovering it in the second week.
• You want it in a location with no way to handle a leak. Electric units get put in closets and attics precisely because they need no venting, which is also how they end up above finished ceilings with no pan and no drain. The absence of a vent requirement is not permission to skip leak containment.

• What breaker and conductor size does this specific unit require?

  The answer should come off the data plate, not off the old installation. Element wattage differs between models with the same tank size.

• Does my panel have a free double-pole space and the capacity for this load?

  Two separate questions, and both need answering before install day. This is the item that turns a half-day job into a fortnight.

• What first hour rating am I getting, compared with what I have now?

  Especially critical if you are moving from gas. Recovery is where electric feels different, and this is the number that predicts it.

• Did you consider a heat pump water heater for this space, and why not?

  You want the reasoning. If the space genuinely cannot host one, fine — but you should hear the reason rather than never hear the option.

• How are you protecting against dissimilar-metal corrosion at the connections?

  Copper to steel connections corrode without appropriate fittings, and it is a slow leak that appears years later at the top of the tank.

• Is there a pan and a drain, and where does the pan drain to?

  Electric units end up in closets and attics more often than any other type, which is exactly where an uncontained leak is most expensive.

• Will you set both thermostats, and what temperature are you setting?

  Two elements, two thermostats. Getting the setting stated and recorded avoids the vague temperature complaints that follow otherwise.

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