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Ultra Gas S3 CT Gas Boiler

Ultra Gas S3 CT Gas Boiler

  • Gas fired water boiler with cast aluminum heat exchanger
  • Venturi mixing body mixes air and gas providing higher efficiency
  • Designed to operate in low temperature condensing applications
  • Outdoor reset and domestic hot water priority standard
  • Negative regulated gas valve precisely delivers gas to the boiler
  • U-Control gives you the power for easy set-up and maintenance
  • Modulates with 5 to 1 turn-down ratio
  • Variable speed motor matches combustion output to heating needs
  • High grade stainless steel burner features quiet operation, high efficiency, and cleaner combustion for low NOx applications

Technical Data

Model AFUE (%) CSA Input (MBH) DOE Heating Cap. (MBH) Net AHRI (MBH) Vent Size (in.)
UG-80 93.5 80 71 62 2 or 3
UG-105 94 105 94 82 2 or 3
UG-155 94 155 139 121 3
UG-230 94.1 230 207 180 3 or 4
UG-299 92.5 299 270 235 4
UG-399 91.7* 399 364* 317 4

Ratings & Reviews

Ultra Gas S3 CT Gas Boiler is rated 3.7 out of 5 by 3.
Rated 5 out of 5 by from GREAT BOILER I BOUGHT THIS BOILER IN 2010 FOR MY HOME AND I VERY GLAD I DID . I LIVE IN NEW JERSEY, MY HOME IS ABOUT 2300 SF. / W 4 HEATING ZONES. BOILER IS SUPPER EFFICIENT AND LOWER MY HEATING BILLS DURING WINTER . SINCE I INSTALLED IT ,NEVER HAD ANY PROBLEMS WITH IT.JUST LOVE IT .IF I HAVE TO BUY AGAIN I WOULD CHOOSE THE SAME BOILER,AND BELIEVE ME I DID MY HOMEWORK BEFORE I BOUGHT THIS BOILER.
Date published: 2017-01-14
Rated 1 out of 5 by from disappointed More service calls because it keeps shutting down. Do not recommend this unit.
Date published: 2017-01-04
Rated 5 out of 5 by from Well McLain boiler's right now Well McLain boiler is excellent boilersinstall 20 never had a problem
Date published: 2017-01-30
  • y_2017, m_2, d_24, h_19
  • bvseo_bulk, prod_bvrr, vn_bulk_0.0
  • cp_1, bvpage1
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  • loc_en_US, sid_ultra-gas-s3-ct-gas-boiler, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
  • clientName_weil-mclain
  • bvseo_sdk, p_sdk, 3.2.0
  • CLOUD, getContent, 65ms
  • REVIEWS, PRODUCT
Ultra Gas S3 CT Gas Boiler is rated 3.7 out of 5 by 3.
Rated 5 out of 5 by from GREAT BOILER I BOUGHT THIS BOILER IN 2010 FOR MY HOME AND I VERY GLAD I DID . I LIVE IN NEW JERSEY, MY HOME IS ABOUT 2300 SF. / W 4 HEATING ZONES. BOILER IS SUPPER EFFICIENT AND LOWER MY HEATING BILLS DURING WINTER . SINCE I INSTALLED IT ,NEVER HAD ANY PROBLEMS WITH IT.JUST LOVE IT .IF I HAVE TO BUY AGAIN I WOULD CHOOSE THE SAME BOILER,AND BELIEVE ME I DID MY HOMEWORK BEFORE I BOUGHT THIS BOILER.
Date published: 2017-01-14
Rated 1 out of 5 by from disappointed More service calls because it keeps shutting down. Do not recommend this unit.
Date published: 2017-01-04
Rated 5 out of 5 by from Well McLain boiler's right now Well McLain boiler is excellent boilersinstall 20 never had a problem
Date published: 2017-01-30
  • y_2017, m_2, d_24, h_19
  • bvseo_bulk, prod_bvrr, vn_bulk_0.0
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_3
  • loc_en_US, sid_ultra-gas-s3-ct-gas-boiler, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
  • clientName_weil-mclain
  • bvseo_sdk, p_sdk, 3.2.0
  • CLOUD, getContent, 57.51ms
  • REVIEWS, PRODUCT