Boiler replacement help

[Rix]

hello
I have a currently working very old Hydrotherm, gas boiler natural vented with three circulators on for 4000 ft.² house. I’m trying to replace it with Well McLean conventional gas fired naturally vented boiler CGI series. I’m a bit confused about what model should I order based on BTU requirements . I would like to match BTU ratings. I’m attaching the picture of my boiler model and series number.

 

[Fitter30]

Your boiler is 80% efficient
New cgi 84%
Might need a flue liner new boiler uses power vent and 3" flue. Old boiler doesn't meet the efficiency standards of today. Measure the flue diameter and does the water heater tie into it. Take a couple of pics of water heater, boiler and flue.

 

[Sponsor]

 

[Sylvan]

I doubt a water heater would tie into it as the input is only 180,000 BTU (peanut boiler)

 

[Rix]

Your boiler is 80% efficient
New cgi 84%
Might need a flue liner new boiler uses power vent and 3" flue. Old boiler doesn't meet the efficiency standards of today. Measure the flue diameter and does the water heater tie into it. Take a couple of pics of water heater, boiler and flue.

thank you for reply . In that case How about CGA? i dont have to power vent then. My vent is 6 inch. Does CGA 6 or CGA 5 would be ok? Yes you are right water heater is tied to it.it seems like 4 inch from water heater

 

[Rix]

I doubt a water heater would tie into it as the input is only 180,000 BTU (peanut boiler)

currently water heater is tied to it with 4 inch, my original Flue is 6 inch. and 4 inch flue comes from water heater.in that case I could do CGA series?and i dont have to do modifications. does CGA 5 or CGA 6 would be sufficient based on original boiler BTUs. thank you for your reply

 

[Fitter30]

WM boiler comes in CGA6 84% efficient 166k btu 3k btu less than output and net. Every have a problem heating the house in your coldest weather because now the time to address the problem. Outdoor reset should be considered resets boiler water temp with outdoor temp. Has two sensors outdoor install north side of house the other leaving side of boiler. WM has a reset that just plugs in and might have a tax or government rebate.

 

[jovoke]

Your boiler is 80% efficient
New cgi 84%
Might need a flue liner new boiler uses power vent and 3" flue. Old boiler doesn't meet the efficiency standards of today. Measure the flue diameter and does the water heater tie into it. Take a couple of pics of water heater, boiler and flue.

Our 20 year old Potterton boiler still works, but we have to manually turn the dial to put it on, as it doesn't always fire up. Were at the point that we think we need to replace it but no idea about where to start. We live in a 3 bedroom terraced house and we had the free loft and cavity installation around 14 years ago. We own our home and are not on any sort of benefits. Q. Is there a government scrappage scheme at the moment - and would we be able to apply for this? We dont have a lot of spare funds, so wondered if its best to do a deal (0% with British Gas). Just no idea where to start. So much on the internet, re Eco boilers etc - just a mind field of info which I have no idea about. Also my energy certificate ran out in December - so in order to get a new one, what do I need to do to get this?

 

[Fitter30]

Have no idea about the UK and rebates. Any condensing boiler to meet the 95% efficiency has to has to have 140°f return water temp above 87%. The colder the better.What are your heat emitters ( fin tube or radiators?) What water are you running? There are few grant programs on the web. The contractor is more important that the boiler brand. Can have a RR auto and have me work on it then you have a banger. Talk to your neighbors or at a plumbing supply store.

Boiler Upgrade Scheme <!-- --> - GOV-UK Find a grant

 

[jrslinteriors]

hello
I have a currently working very old Hydrotherm, gas boiler natural vented with three circulators on for 4000 ft.² house. I’m trying to replace it with Well McLean conventional gas fired naturally vented boiler CGI series. I’m a bit confused about what model should I order based on BTU requirements . I would like to match BTU ratings. I’m attaching the picture of my boiler model and series number.

Hello!

Replacing your old Hydrotherm boiler with a Weil-McLain CGI series is a great choice for efficiency and reliability. Matching BTU requirements is crucial to ensure the new boiler adequately meets your home's heating needs without being oversized or undersized.

Here’s how you can approach this:

Cheque the Existing Boiler’s BTU Input/Output:
From the picture of your current boiler model and series, look for its BTU ratings (input/output). This will typically be on the data plate. If you’ve uploaded a picture, double-cheque these details.

Perform a Heat Load Calculation:
While matching BTU is a good start, it’s also essential to confirm that your home's current heat loss requires the same BTU output. Factors like insulation, windows, and local climate can impact this. A professional HVAC contractor can perform a Manual J calculation for precise sizing.

Circulators and Zones:
With three circulators for a 4,000 sq. ft. house, you’ll want to ensure the new boiler can handle your zoning setup. The Weil-McLain CGI series has several models with varying BTU outputs, so select one that aligns with your system's demand.

Ventilation Requirements:
The CGI series is a naturally vented boiler, so ensure your current venting setup is compatible or make adjustments as needed. Consult the Weil-McLain installation guide for specifics.

Model Selection:
Weil-McLain CGI boilers range from 50,000 to over 200,000 BTU. For a 4,000 sq. ft. house, you’re likely looking at a model in the mid-to-upper range, but this depends on your specific BTU requirements.

If you're still unsure, sharing the BTU rating of your current boiler from the photo would help narrow down the options. Additionally, consulting with a local HVAC professional or Weil-McLain distributor can provide you with precise guidance based on your home's needs and local building codes.

Good luck with your upgrade! Let us know if you need more help.

 

[Rix]

great tips and much appreciated

 

[Rix]

Hello!

Replacing your old Hydrotherm boiler with a Weil-McLain CGI series is a great choice for efficiency and reliability. Matching BTU requirements is crucial to ensure the new boiler adequately meets your home's heating needs without being oversized or undersized.

Here’s how you can approach this:

Cheque the Existing Boiler’s BTU Input/Output:
From the picture of your current boiler model and series, look for its BTU ratings (input/output). This will typically be on the data plate. If you’ve uploaded a picture, double-cheque these details.

Perform a Heat Load Calculation:
While matching BTU is a good start, it’s also essential to confirm that your home's current heat loss requires the same BTU output. Factors like insulation, windows, and local climate can impact this. A professional HVAC contractor can perform a Manual J calculation for precise sizing.

Circulators and Zones:
With three circulators for a 4,000 sq. ft. house, you’ll want to ensure the new boiler can handle your zoning setup. The Weil-McLain CGI series has several models with varying BTU outputs, so select one that aligns with your system's demand.

Ventilation Requirements:
The CGI series is a naturally vented boiler, so ensure your current venting setup is compatible or make adjustments as needed. Consult the Weil-McLain installation guide for specifics.

Model Selection:
Weil-McLain CGI boilers range from 50,000 to over 200,000 BTU. For a 4,000 sq. ft. house, you’re likely looking at a model in the mid-to-upper range, but this depends on your specific BTU requirements.

If you're still unsure, sharing the BTU rating of your current boiler from the photo would help narrow down the options. Additionally, consulting with a local HVAC professional or Weil-McLain distributor can provide you with precise guidance based on your home's needs and local building codes.

Good luck with your upgrade! Let us know if you need more help.

thank you so much for tips and detailed info

 

[Sylvan]

Have you thought about a

JX-100 84,000 BTU Output Mini-Therm Gas-Fired Hydronic Boiler w/ Pump (0-2,000 FT)​

They are light and have a very small foot print,

I installed 100's of them and Hydro therm in lieu of one or 2 big boilers

Less than 200 pounds the Mini therm is easy to handle and light enough for one person to set in place and pipe in and it cost effective