Adding solar panels is a great time to rethink hot water.
This is even more true in homes with mixed heat systems.
Your setup is not simple, but it can work very well.
You already have a 50-gallon indirect water heater.
It is heated by a propane boiler during part of the year.
In winter, your wood-fired boiler also helps heat the tank.
That same wood boiler heats your radiant floor system.
Now you want electric hot water for summer use.
That makes sense with a new solar array.
Solar power can help offset electric water heating costs.
But the clawfoot tub changes the sizing question.
Large tubs need a lot of hot water at once.
A standard small electric tank may feel weak.
A tankless electric water heater may also be a poor fit.
Many whole-house electric tankless units need heavy wiring.
They can also struggle with high flow demands.
For this home, stored hot water is still important.
A larger electric tank could be one simple answer.
A heat pump water heater may be a better long-term choice.
Heat pump water heaters use electricity very efficiently.
You can learn more from the U.S. Department of Energy.
The ENERGY STAR heat pump water heater guide is also useful.
A hybrid heat pump tank can work well in summer.
It can heat water with solar-backed electricity.
It also keeps stored water ready for the tub.
For a clawfoot tub, consider 65 to 80 gallons.
This depends on the tub size and water temperature.
You may also keep the indirect tank for winter.
Then use the electric tank during warmer months.
A plumber can install pipe valves for seasonal switching.
This allows the best fuel source by season.
Question
Should I add an electric water heater for summer use?
Answer
Yes. A hybrid heat pump water heater is likely the best summer upgrade. Choose a larger tank if the clawfoot tub needs high hot water volume.
Before buying, measure the tub volume.
Also, check your electrical panel capacity.
A licensed plumber should review the piping plan.
An electrician should review the solar and breaker load.
This helps avoid weak recovery and costly surprises.
The goal is simple.
Use wood heat when it is already running.
Use propane only when needed.
Use solar-backed electricity during warmer months.
That setup can give comfort and lower fuel use.
I’m Chris Mayer, writing for Plumbing 101.
