Water heater part ยท Seelink

Seelink TANK002-1 Expansion Tank

Water heater part

Water heater partFits most water heater lines3/4-inch MNPT

Updated October 2026

The short answer

A solid water heater part for installing or servicing a tankless heater.

Delivers
Water heater part.
Watch for
Model-specific: check the manual.
Suits
Installing or servicing a tankless heater.
Connections
3/4-inch MNPT
Fits
most water heater lines
Prices change often; the button shows today's price.

Each button opens this exact model. We may earn a commission on tracked links; it never changes what we publish. Disclosure

What it delivers

The Seelink TANK002-1 Expansion Tank is a water heater part whose listing says it fits most water heater lines.

Match the part to the exact heater model and its manual before ordering.

Expansion tanks are sized to the system's volume and pressure; relief valves to the heater's rating. Match the part to the heater's manual and local code.

From the listing: connections: 3/4-inch MNPT; model: TANK002-1; fits: most water heater lines.

The listing gives thermal expansion tank in the box.

Right unit for this house?

Install it when

  • Installing or servicing a tankless heater
  • Matching a part named in the manual

Look at another unit when

  • Heaters it doesn't name

Strengths and trade-offs

Strengths

  • Water heater part
  • Names most water heater lines

Trade-offs

  • Model-specific: check the manual

Install limits

  • Figures are the maker's or seller's own. Flow at a rise is our estimate from the input; gas, venting and electrical work needs a licensed professional.

Rated performance

Every figure below comes from the source shown in brackets. Where the maker doesn't state something, we say so instead of estimating.

Model numberTANK002-1Retailer
Connections3/4-inch MNPTRetailer
Fitsmost water heater linesRetailer

Rival units at this flow

More venting and install parts rated for similar demand

Full venting and install parts spec grid

Final verdict

A solid water heater part for installing or servicing a tankless heater.

Buy this unit

Our links open this exact model's product page. Prices and stock change; check what's included before you order.

Prices change often; the button shows today's price.

Each button opens this exact model. We may earn a commission on tracked links; it never changes what we publish. Disclosure

Questions buyers ask

Will the Seelink TANK002-1 Expansion Tank fit my heater?
Only if its listing or maker names your heater model or series (it lists: most water heater lines). Check the part number in your heater's installation manual.