flir67 wrote:
I'm going to replace my water heater soon. its a 40 gallon gas, its 30
years old and doing great but getting worried about it because of the
age. its a hotpoint.

I would like to install a whole house water filter on the inlet side
of this new water heater. is this recommended or not for the water
pressure? I've recently upgraded all the appliances to whirlpool but
not sure if whirlpool is good or crap for a water heater.

the house is 2400sq ft L shape with 3 family members 2 full bathrooms
and dishwasher on a slab.

Why filter hot water? You don't drink or cook with it.

Hot water does what it does (wash - humans, pets, dishes, clothes) then goes
down the drain.

Further, that your existing heater has lasted 30 years speaks well of the
water in your area. That is, your water source contains very little debris,
chemicals, or other noxious substances. I doubt your water quality will
improve much by being filtered.

As to choice of brands, I think the major brands are virtually
interchangable. Water heaters have improved in efficiency during these
years, so you should see a significant saving in energy costs.