I have a gas Laars Endurance EBP 110 that provides DHW and forced based board heat for a 1600 sqft townhouse. Unsure of how old but a plumber recently told me it's about 14 years old. The pictures make a long story short (intermittent DHW, ok pressure), if you'd like the long story let me know.
Laars tech said I probably also need to replace the anti-condensing valve as that is probably what is causing the scaling.
(that and hard water)
I can buy a new heat exchanger for ~$.
My question is, are there any tricks to getting the old one out and the new one in? I haven't tried it yet but it looks VERY tight, especially the nuts in the back. Special tools that make it easier?
Do I need to completely turn off the boiler? ie gas, electric and water supply? Or is it enough to just turn off the water supply, drain the system and turn off the heat so the unit cools down enough to work on?
Or should I just be thinking about replacing it. I got one quote for $ and another about $, not including rebates. Both quotes seem crazy high though I am in the north east and really enjoy hot showers...