By SmartPool



Model # S421

Warranty 5 Year

Manufacturer Code S421P

Alternate Part #'s SMP-15-917

Product Description

Sunheater 4' x 20' Solar Heating System Aboveground Pool

• Raises Pool Water Temperature 10° F (6° C) or More
• Simple Do-It-Yourself Installation
• 4' x 20' of Solar - 80,000 BTUs Daily!
• Uses Existing Pool Pump
• Tube on Web Design for Maximum Exposure to Sun's Rays
• No Fuel or Electricity Bills or Expensive Installation of Equipment and Connections
• Easy to Drain for Winterizing

(1) 4' x 20' polypropylene collectors, (2) elbows/hose-connector adapters, (2) end caps, (2) connector hoses for additional system, (4) stainless steel clamps, (1) roll of Teflon tape, (1) installation/operation manual.

Caution: Photo for presentation purposes only. Do not install your system close enough to pool to allow children to use it to climb into the pool.

Product Specifications

Pool Type:
Above Ground
80000 BTU
Max Pool Size:
Oval 16 ft. x 25 ft. Round 24 ft.
Header Size:
1-1/2 in.
Panels (4 x 20 ft):
Includes Installation Kit:

?     Asked on 6/10/2009by Guest

Is anything else required when I purchase the S421 system?

A  Answered on 6/10/2009 by InyoPools Product Specialist Patrick P.

You will require 2 hoses - one that will reach from the pool equipment to the solar collector and one that reaches from the solar collector back to the pool, this hose kit can be purchased here > The diverter valve is not required to operate the system but is an upgraded option which would allow you to bypass the solar system at night time thus preventing the cooling of water at night, we would recommend the diverter valve which is a part # of SK35 which you may view or purchase here > 

?     Asked on 5/27/2015by Patrick

Can this be installed on a roof Thanks

A  Answered on 5/27/2015 by InyoPools Product Specialist Patrick P.

Yes this solar heating system can be mounted on the roof.  You would require 1 Solar Mounting Kit SK-43 for each solar box and in high wind areas you will need 1 SK-34 High Wind Kit for Each Solar Collector.

?     Asked on 2/6/2016by joann

my pool is 16by32 will this heat my pool? also can i have someone install it? what is the guarentee?

A  Answered on 2/8/2016 by InyoPools Product Specialist Lennox H.

Hi Joann, For your size pool you will need 2 Units. You cal have someone install it. This system comes with a 5 Year Limited Warranty as outlined in the SunHeater S421 Owner's Manual.

?     Asked on 3/14/2016by Inyo Visitor

is this for above ground only or can it be used on in ground pools?

A  Answered on 3/16/2016 by InyoPools Product Specialist Lennox H.

Hi, This is for above ground pool only, click link>SunHeater In-Ground< for in-ground solar heating systems.

?     Asked on 4/30/2018by Eric Herzer

how much does this cost

A  Answered on 4/30/2018 by InyoPools Product Specialist Lennox H.

Hi, Eric. This item we no longer carry. We're unable to provide you with a price. 


Review Summary

 (Average 5  out of 5 stars)
2 Rating
5 star:
4 star:
3 star:
2 star:
1 star: