Replacing one hot water radiator with a Rundtal hydronic wall panel

I’m looking to replace one of the hot water radiators I have in my parlor floor apt with a slimmer profile Rundtal hydronic wall panel (https://runtalnorthamerica.com/product/hydronic-wall-panels/). It’s a long story – but I’ve found a fantastic marble mantel to retrofit around the radiator – but I need the profile to be slimmer to make this work. A couple questions:

– Is it o.k. to replace only ONE of the radiators that are on the same boiler system?
– Does anyone have recommendations for a licensed / insured plumber for a job like this that’s worked with Rundtal radiators? It looks like it will involve moving the pipes closer to the wall by removing the flooring / subfloor and accessing my the pipes that are in my downstairs neighbor’s soffit.
– Any other pitfalls I should be aware of?

Thanks in advance! [View recent photos](//muut.com/u/brownstoner/s3/:brownstoner:hoR9:viewrecentphotos.png.jpg)

annep

in General Discussion 4 years and 1 month ago

2

Please log in, in order to post replies!

2 replies

Newest Oldest

ellenlourie | 4 years ago

string(1) "1"
object(WP_User)#4888 (8) {
  ["data"]=>
  object(stdClass)#4865 (12) {
    ["ID"]=>
    string(6) "209451"
    ["user_login"]=>
    string(11) "ellenlourie"
    ["user_pass"]=>
    string(34) "$P$BW7BCPC4MhhU4md6aHcLH/64c1GhM1/"
    ["user_nicename"]=>
    string(11) "ellenlourie"
    ["user_email"]=>
    string(22) "ellen.lourie@gmail.com"
    ["user_url"]=>
    string(0) ""
    ["user_registered"]=>
    string(19) "2024-06-29 12:47:36"
    ["user_activation_key"]=>
    string(0) ""
    ["user_status"]=>
    string(1) "0"
    ["display_name"]=>
    string(11) "ellenlourie"
    ["spam"]=>
    string(1) "0"
    ["deleted"]=>
    string(1) "0"
  }
  ["ID"]=>
  int(209451)
  ["caps"]=>
  array(1) {
    ["bbp_participant"]=>
    bool(true)
  }
  ["cap_key"]=>
  string(15) "wp_capabilities"
  ["roles"]=>
  array(1) {
    [0]=>
    string(15) "bbp_participant"
  }
  ["allcaps"]=>
  array(1) {
    ["bbp_participant"]=>
    bool(true)
  }
  ["filter"]=>
  NULL
  ["site_id":"WP_User":private]=>
  int(1)
}

If you have constant flow system with outdoor reset, then it’s not a problem, just size new radiator properly. If it is system with set temperature and pump is controlled by the thermostat, then you will have issues with the heating if the rest of the house is heated with cast iron radiators.

hkapstein | 4 years and 1 month ago

string(1) "1"
object(WP_User)#4887 (8) {
  ["data"]=>
  object(stdClass)#4886 (12) {
    ["ID"]=>
    string(6) "197623"
    ["user_login"]=>
    string(9) "hkapstein"
    ["user_pass"]=>
    string(34) "$P$Bi/rarQU.AidQ5DWnWIzXSi7UikLcx/"
    ["user_nicename"]=>
    string(31) "boerumamaemailnotprovided-local"
    ["user_email"]=>
    string(19) "hkapstein@gmail.com"
    ["user_url"]=>
    string(0) ""
    ["user_registered"]=>
    string(19) "2018-06-15 18:43:24"
    ["user_activation_key"]=>
    string(0) ""
    ["user_status"]=>
    string(1) "0"
    ["display_name"]=>
    string(14) "Helen Kapstein"
    ["spam"]=>
    string(1) "0"
    ["deleted"]=>
    string(1) "0"
  }
  ["ID"]=>
  int(197623)
  ["caps"]=>
  array(1) {
    ["subscriber"]=>
    bool(true)
  }
  ["cap_key"]=>
  string(15) "wp_capabilities"
  ["roles"]=>
  array(1) {
    [0]=>
    string(10) "subscriber"
  }
  ["allcaps"]=>
  array(3) {
    ["read"]=>
    bool(true)
    ["level_0"]=>
    bool(true)
    ["subscriber"]=>
    bool(true)
  }
  ["filter"]=>
  NULL
  ["site_id":"WP_User":private]=>
  int(1)
}

You have a cast iron radiator there, so replacing it with a steel radiator will change it’s properties. Steel will heat up much quicker than cast iron, so this radiator will get hot while the others are warming up. Likely you can balance this out with balancing valves or a thermostatic radiator valve. I’d get a TRV for it to make life simple. If it’s in a series with other radiators that could complicate it a bit, but I think that is probably not the case here.